var isIE = document.all?true:false;
var myimg = new Image();
var sPos = 0;
var isTh = false;
var isNg = false;
var kbmode = "roman";
var pkbmode = "roman";
var SplKeys = new Array();
var toShowHelp = true;

SplKeys["ZR"] = 0;
SplKeys["BS"] = 8;
SplKeys["CR"] = 13;

function incfont(fontname, fontfile)
{
if(isIE)
        document.write("<STY"+"LE TYPE='text/css'>\n<!--\n@font-face {\n"
                                + "font-family: "+fontname+";\nsrc:url("+fontfile+".eot);\n"
                                + "}\n-->\n</ST"+"YLE>")
}


function convertThis(e,numchar)
{
    if (!isIE)
            Key = e.which;
    else
                Key = e.keyCode;

        Char = String.fromCharCode(Key);
        if(typeof numchar == "undefined")
                numchar = 4;
        if( isIE )
        {
                myField = e.srcElement;
                myField.caretPos = document.selection.createRange().duplicate();
                prevChar = myField.caretPos.text;
                diff = 0;
                cpos = getCursorPosition(myField);
                if(prevChar.length != 0)
                        document.selection.clear();
                if(myField.value.length != 0 && cpos != "1,1" )
                {
                        myField.caretPos.moveStart('character',-1);
                        prevChar = myField.caretPos.text;
                        diff ++;
                }
                if(prevChar == chnbin)
                {
                        myField.caretPos.moveStart('character',-1);
                        prevChar = myField.caretPos.text;
                        diff ++;
                }

                if(cpos[1] > numchar )
                {
                        myField.caretPos.moveStart('character', diff - numchar);
                        prevChar = myField.caretPos.text;
                }
                if(prevChar == "" && cpos != "1,1")
                        prevChar =  "\u000A";
                if(Key == 13)
                        Char = "\u000A";
                myField.caretPos.text = getLang(prevChar,Char, 0)
                e.cancelBubble = true;
                e.returnValue = false;
        }
        else
        {
                myField = e.target;
                if( myField.selectionStart >= 0)
                {
                        if(isSplKey(Key) ||  e.ctrlKey )
                                return true;
                        var startPos = myField.selectionStart;
                        var endPos = myField.selectionEnd;
                        txtTop = myField.scrollTop;
                        if(myField.value.length == 0)
                        {
                                prevChar = "";
                                myField.value = getLang(prevChar,Char, startPos)
                        }
                        else
                        {
                                prevChar = myField.value.substring(startPos - 1,startPos);
                                prevStr =  myField.value.substring(0,startPos - 1);
                                if(prevChar == chnbin)
                                {
                                        prevChar = myField.value.substring(startPos - 2,startPos);
                                        prevStr =  myField.value.substring(0,startPos - 2);
                                }
                                cpos = getCursorPosition(myField);
                                if(cpos[1] >= numchar)
                                {
                                        prevChar = myField.value.substring(startPos - numchar,startPos);
                                        prevStr =  myField.value.substring(0,startPos - numchar);
                                }
                                myField.value = prevStr + getLang(prevChar,Char, myField.selectionStart)
                                                  + myField.value.substring(endPos, myField.value.length);
                        }
                        myField.selectionStart = sPos ;
                        myField.selectionEnd = sPos;
                        if((myField.scrollHeight+4)+"px" != myField.style.height)
                                myField.scrollTop = txtTop;
                        e.stopPropagation();
                        e.preventDefault();
                }
        }
        showCombi(e)
}

function toggleT(obj)
{
        isTh = obj.checked;
        if(isTh)
                ta['t'] = "\u0BA4\u0BCD";
        else
                ta['t'] = "\u0B9F\u0BCD";
}

function toggleG(obj)
{
        isNg = obj.checked;
        if(isNg)
                ta['g'] = "\u0B99\u0BCD";
        else
                ta['g'] = "\u0B95\u0BCD"
}

function toggleKBMode(e,obj)
{
        if(obj != null)
        {
                pkbmode = kbmode;
                kbmode = obj.value;
                if(kbmode == "typewriter" && lang != 'english')
                        myimg.src = "images/"+lang+"tw.png";
                else if(kbmode == "tamil99")
                        myimg.src = "images/tamil99.png";
                else
                        myimg.src = "images/"+lang+".png";
        }
        else
        {
                if (!isIE)
                key = e.which;
            else
                        key = e.keyCode;
                if (key == 123)
                {
                        if(kbmode != "english")
                        {
                                pkbmode = kbmode;
                                kbmode = "english";
                        }
                        else
                        {
                                kbmode = pkbmode;
                                pkbmode = "english";
                        }
                }

        }
}

function isSplKey(keynum)
{
        retVal = false;
        for(i in SplKeys)
        {
                if(keynum == SplKeys[i])
                        retVal = true;
        }
        return retVal;
}

function getLang(prv, txt, sP)
{
        sPos = sP;
        if(kbmode == "english")
        {
                retTxt = prv+txt;
                sPos ++;
        }
        else if(kbmode == "typewriter")
        {
                if(prv == ugar && mapLang(txt,sP,"tw") == uugar)
                        retTxt = mapLang(prv+txt,sP,"tw");
                else
                        retTxt = prv+mapLang(txt,sP,"tw");
        }
        else if(kbmode == "tamil99")
        {
                retTxt = mapLang(prv+txt,sP,"t99");
        }
        else
        {
                if(pkbmode == "english")
                {
                        retTxt = prv+mapLang(txt);
                        pkbmode = "roman";
                }
                else
                        retTxt = mapLang(prv+txt);
        }
        return retTxt;
}

function mapLang(txt,sP,mod)
{
        if(sP != null)
                sPos = sP;
        prvlen = txt.length;
        txtarr = eval(lang.substring(0,2));
        if(mod != null && mod == "tw")
                txtarr = eval(lang.substring(0,2)+"tw");
        if(mod != null && mod == "t99")
                txtarr = eval(lang.substring(0,2)+"99");
        retTxt = "";
        for(itm in txtarr)
        {
                rexp = new RegExp(itm,"g");
                txt = txt.replace(rexp, txtarr[itm]);
        }
        sPos += (txt.length -prvlen +1);
        return txt;
}

function getCursorPosition(textarea)
{
        var txt = textarea.value;
        var len = txt.length;
        var erg = txt.split("\n");
        var pos = -1;
        if(typeof document.selection != "undefined")
        { // FOR MSIE
        range_sel = document.selection.createRange();
        range_obj = textarea.createTextRange();
        range_obj.moveToBookmark(range_sel.getBookmark());
        range_obj.moveEnd('character',textarea.value.length);
        pos = len - range_obj.text.length;
        }
        else if(typeof textarea.selectionStart != "undefined")
        { // FOR MOZILLA
        pos = textarea.selectionStart;
        }
        if(pos != -1)
        {
                for(ind = 0;ind<erg.length;ind++)
                {
                        len = erg[ind].length + 1;
                        if(pos < len)
                                break;
                        pos -= len;
                }
                ind++; pos++;
                return [ind, pos]; // ind = LINE, pos = COLUMN
        }
}

function showCombi(e)
{
    if(document.getElementById('HelpDiv') == null)
    {
            helpdiv  = document.createElement('div');
                helpdiv.setAttribute('id','HelpDiv');
                helpdiv.setAttribute('align','left');
                bdy = document.getElementsByTagName('BODY')[0];
                bdy.appendChild(helpdiv);

                helpstyle = getStyleObject('HelpDiv');
                helpstyle.width = '140px';
                helpstyle.border = 'solid 1px #0DE8E9';
                helpstyle.backgroundColor= '#BDE8E9';
                helpstyle.position = 'absolute';
                if(isIE)
                {        helpstyle.left = '440px';        helpstyle.top = '230px';        }
                else
                {        helpstyle.left = '410px';        helpstyle.top = '250px';        }
        }
        else
        {
                helpdiv  = document.getElementById('HelpDiv');
                helpstyle = getStyleObject('HelpDiv');
        }
        if(!toShowHelp || kbmode != 'roman')
        {        helpstyle.display = 'none';        return;        }

        prevWord =  getLang(prevChar,Char,0)
        if(isLangOtru(prevWord.substring(prevWord.length - 1)))
                prevWord = prevWord.substring(prevWord.length - 2)
        else
                prevWord = prevWord.substring(prevWord.length - 1)

        helptxt = "";
        prevLet = getLang(prevWord,Char,0); prevLet = prevLet.substring(prevLet.length - 1);
        if( prevWord != "" && !isLangOtru(prevWord) && prevLet != getLang('',Char,0) )
        {
                if(Char == 'a' || Char == 'i' ||Char == 'u' || Char == 'e' || Char == 'o' )
                {
                        helptxt =  prevWord+ ' + ' + Char+' = ' + getLang(prevWord,Char,0) + "<br>" ;
                        if(Char == 'a')
                                helptxt +=  prevWord + ' + i = ' + getLang(prevWord,'i',0) + "<br>"
                                                  + prevWord + ' + u = ' + getLang(prevWord,'u',0) + "<br>";
                }
                else if( Char != getLang('',Char,0))
                {
                        helptxt = prevWord + ' + a = ' + getLang(prevWord,'a',0) + "<br>"
                                + prevWord + ' + A = ' + getLang(prevWord,'A',0) + "<br>"
                                + prevWord + ' + i = ' + getLang(prevWord,'i',0) + "<br>"
                                + prevWord + ' + I = ' + getLang(prevWord,'I',0) + "<br>"
                                + prevWord + ' + u = ' + getLang(prevWord,'u',0) + "<br>"
                                + prevWord + ' + U = ' + getLang(prevWord,'U',0) + "<br>"
                                + prevWord + ' + e = ' + getLang(prevWord,'e',0) + "<br>"
                                + prevWord + ' + E = ' + getLang(prevWord,'E',0) + "<br>"
                                + prevWord + ' + o = ' + getLang(prevWord,'o',0) + "<br>"
                                + prevWord + ' + o = ' + getLang(prevWord,'O',0) + "<br>"
                                + prevWord + ' + a + u = ' + getLang(getLang(prevWord,'a',0),'u',0) + "<br>";
                                + prevWord + ' + a + i = ' + getLang(getLang(prevWord,'a',0),'i',0) + "<br>"
                        if(lang == 'tamil')
                        {
                                if(getLang('','t',0) == prevWord)
                                        helptxt += prevWord + ' + h = ' + getLang(prevWord,'h',0) + "<br>";
                                if(getLang('','s',0) == prevWord)
                                        helptxt += prevWord + ' + h = ' + getLang(prevWord,'h',0)+ "<br>";
                                if(getLang('','S',0) == prevWord)
                                        helptxt += prevWord + ' + r + I = ' + getLang(getLang(prevWord,'r',0),'I',0) + "<br>";
                                if(getLang('k','n',0).indexOf(prevWord) > 0 )
                                        helptxt += prevWord + ' + t + h = ' + getLang(getLang(prevWord,'t',0),'h',0) + "<br>"
                                                                + prevWord + ' + g = ' + getLang(prevWord,'g',0) + "<br>"
                                                                + prevWord + ' + j = ' + getLang(prevWord,'j',0) + "<br>";
                        }
                }
                helpdiv.innerHTML = '<table><tr><td><font size="2">'+ helptxt + '</font></td></tr></table>';
                helpstyle.display = 'inline';
        }
        else
                helpstyle.display = 'none';
        if(isIE)
        {        myPos  = getCursorPosition(e.srcElement);        tfact = 16;        }
        else
        {        myPos  = getCursorPosition(e.target);        tfact = 20;        }
        topsize = (250 + (myPos[0] - 1) * tfact) ;
        leftsize = (410 + myPos[1] * 5) ;
        if(topsize > 815) topsize = 815;
        if(leftsize > 930) leftsize = 930;

        if(isIE)
        {        helpstyle.left = (leftsize + 30) + 'px';        helpstyle.top = (topsize - 20) + 'px';        }
        else
        {        helpstyle.left = leftsize + 'px';        helpstyle.top = topsize + 'px';        }
        document.onmouseover = hideHelp;
}

function isLangOtru(letter)
{
        isOtru = false;
        otruArr = new Array (        '\u200C',
        "\u0BCD","\u0BBE","\u0BBF","\u0BC0", "\u0BC1","\u0BC2","\u0BC6","\u0BC7","\u0BC8","\u0BCA","\u0BCB","\u0BCC", // Tamil
        "\u0C4D","\u0C3E","\u0C3F","\u0C40","\u0C41","\u0C42","\u0C46","\u0C47","\u0C48","\u0C4A","\u0C4B","\u0C4C","\u0C43","\u0C44","\u0C01","\u0C02","\u0C03",  //Telugu
        "\u094D","\u093E","\u093F","\u0940","\u0941","\u0942","\u0946","\u0947","\u0948","\u094A","\u094B","\u094C","\u0901","\u0902","\u0903",// Hindi
        "\u0D3E","\u0D3F","\u0D40","\u0D41","\u0D42","\u0D43","\u0D47","\u0D46","\u0D48","\u0D4A","\u0D4B","\u0D4C","\u0D02","\u0D03",  //Malayalam
        "\u0CBE","\u0CBF","\u0CC0","\u0CC1","\u0CC2","\u0CC3","\u0CC4","\u0CC6","\u0CC7","\u0CC8","\u0CCA","\u0CCB","\u0CCC","\u0C82","\u0C83",//Kannada
        "\u0ABE","\u0ABF","\u0AC0","\u0AC1","\u0AC2","\u0AC5","\u0AC7","\u0AC8","\u0AC9","\u0ACB","\u0ACC","\u0A81","\u0A82","\u0A83",//Gujarathi
        "\u0B3E","\u0B3F","\u0B40","\u0B41","\u0B42","\u0B46","\u0B47","\u0B48","\u0B4A","\u0B4B","\u0B4C","\u0B01","\u0B02","\u0B03",//Oriya
        "\u09BE","\u09BF","\u09C0","\u09C1","\u09C2","\u09C6","\u09C7","\u09C8","\u09CA","\u09CB","\u09CC","\u0981","\u0982","\u0983",//Bengali
        "\u0A3E","\u0A3F","\u0A40","\u0A41","\u0A42","\u0A46","\u0A47","\u0A48","\u0A4A","\u0A4B","\u0A4C","\u0A50","\u0A03"//Punjabi
        );
        for(i=0;i<otruArr.length;i++)
                if(otruArr[i] == letter)
                        isOtru = true;
        return isOtru;
}