Creating Calender Using Java Script

    function showseldate(obj)
    {
        if(obj.value!="")
        {
            seldate.innerHTML="<b>" + parseInt(document.calform.drpmonth.value)+1 + "/" + obj.value + "/" + document.calform.drpyear.value + "</b>";
        }    }
    function changecalendar()
    {
        var m,y;
        m=document.calform.drpmonth.value;
        y=document.calform.drpyear.value;
        displaycalendar(m,y);
    }
    function showcurcal()
    {
        var dt=new Date();
        var m,y;        m=dt.getMonth();        y=dt.getFullYear();
        displaycalendar(m,y);        
    }
    function displaycalendar(m,y)
    {
        var nod=numofdays(parseInt(m)+1,y);
        var wd;        var dt=new Date();
        var curday=dt.getDate();        dt.setDate(1);
        dt.setMonth(m);        dt.setFullYear(y);            wd=dt.getDay();
        clear();
        for(var i=1;i<=nod;i++)
        {
            document.calform.txtday[wd].value=i;
            if(i==curday)
            {
                document.calform.txtday[wd].style.backgroundColor="red";
                document.calform.txtday[wd].style.color="white";
            }
            wd++;
        }        
    }
    function clear()
    {
        for(var i=0;i<42;i++)
        {
            document.calform.txtday[i].value="";
        }    }            
  

 
    for(var i=1;i<=6;i++)
    {
        document.write("tr bgcolor='#FFCC00' >");
        for(var j=1;j<=7;j++)
        {
            document.write("td><div align='center'><input name='txtday' type='text' size='3' onclick='showseldate(this)' readonly></div></td>");
        }        document.write("</tr>");    }