datetime picker is not opening

Hi I have a java servlet code in this date time picker is not opening. The same opens in JSP code. My code is:

  **function.js**
  <script language="javascript" type="text/javascript" src="datetimepicker.js">

  //Date Time Picker script- by TengYong Ng of http://www.rainforestnet.com
     //Script featured on JavaScript Kit (http://www.javascriptkit.com)
    //For this script, visit http://www.javascriptkit.com 

  </script>

javaservlet.java package com.dept;

   import java.io.IOException;
   import java.io.PrintWriter;
    public class javaservlet extends HttpServlet {
private static final long serialVersionUID = 1L;

     public javaservlet() {
    super();    }

 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {  }

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    PrintWriter out=response.getWriter();
            try
    {
            out.println("<html>");
            out.println("<head>");
                            out.println("</head>");
            out.println("<body>");
                            out.println("<input type='text' name='doj' id='demo1'><a href='javascript:NewCal('demo1','ddmmyyyy')'><img src='cal.gif' width='16' height='16' border='0' alt='Pick a date'></a>pick a date... ");
             }
             catch(Exception e)
    {
        out.println("Exception:"+e);
    }
         }
    }

datetimepicker.js //Javascript name: My Date Time Picker //Date created: 16-Nov-2003 23:19 //Scripter: TengYong Ng //Website: http://www.rainforestnet.com //Copyright (c) 2003 TengYong Ng //FileName: DateTimePicker.js //Version: 0.8 //Contact: [email protected] // Note: Permission given to use this script in ANY kind of applications if // header lines are left unchanged.

//Global variables var winCal; var dtToday=new Date(); var Cal; var docCal; var MonthName=["January", "February", "March", "April", "May", "June","July", "August", "September", "October", "November", "December"]; var WeekDayName=["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"];
var exDateTime;//Existing Date and Time

//Configurable parameters var cnTop="200";//top coordinate of calendar window. var cnLeft="500";//left coordinate of calendar window var WindowTitle ="DateTime Picker";//Date Time Picker title. var WeekChar=2;//number of character for week day. if 2 then Mo,Tu,We. if 3 then Mon,Tue,Wed. var CellWidth=20;//Width of day cell. var DateSeparator="/";//Date Separator, you can change it to "/" if you want. var TimeMode=24;//default TimeMode value. 12 or 24

var ShowLongMonth=true;//Show long month name in Calendar header. example: "January". var ShowMonthYear=true;//Show Month and Year in Calendar header. var MonthYearColor="#cc0033";//Font Color of Month and Year in Calendar header. var WeekHeadColor="#0099CC";//Background Color in Week header. var SundayColor="#6699FF";//Background color of Sunday. var SaturdayColor="#CCCCFF";//Background color of Saturday. var WeekDayColor="white";//Background color of weekdays. var FontColor="blue";//color of font in Calendar day cell. var TodayColor="#FFFF33";//Background color of today. var SelDateColor="#FFFF99";//Backgrond color of selected date in textbox. var YrSelColor="#cc0033";//color of font of Year selector. var ThemeBg="";//Background image of Calendar window. //end Configurable parameters //end Global variable

function NewCal(pCtrl,pFormat,pShowTime,pTimeMode) { Cal=new Calendar(dtToday); if (pCtrl!=null) Cal.Ctrl=pCtrl; if (pFormat!=null) Cal.Format=pFormat.toUpperCase();

exDateTime=document.getElementById(pCtrl).value;
if (exDateTime!="")//Parse Date String
{
    var Sp1;//Index of Date Separator 1
    var Sp2;//Index of Date Separator 2 
    var tSp1;//Index of Time Separator 1
    var tSp1;//Index of Time Separator 2
    var strMonth;
    var strDate;
    var strYear;
    var intMonth;
    var YearPattern;
    //parse month
    Sp1=exDateTime.indexOf(DateSeparator,0);
    Sp2=exDateTime.indexOf(DateSeparator,(parseInt(Sp1)+1));

    if ((Cal.Format.toUpperCase()=="DDMMYYYY") || (Cal.Format.toUpperCase()=="DDMMMYYYY"))
    {
        strMonth=exDateTime.substring(Sp1+1,Sp2);
        strDate=exDateTime.substring(0,Sp1);
    }
    else if ((Cal.Format.toUpperCase()=="MMDDYYYY") || (Cal.Format.toUpperCase()=="MMMDDYYYY"))
    {
        strMonth=exDateTime.substring(0,Sp1);
        strDate=exDateTime.substring(Sp1+1,Sp2);
    }
    if (isNaN(strMonth))
        intMonth=Cal.GetMonthIndex(strMonth);
    else
        intMonth=parseInt(strMonth,10)-1;   
    if ((parseInt(intMonth,10)>=0) && (parseInt(intMonth,10)<12))
        Cal.Month=intMonth;
    //end parse month
    //parse Date
    if ((parseInt(strDate,10)<=Cal.GetMonDays()) && (parseInt(strDate,10)>=1))
        Cal.Date=strDate;
    //end parse Date
    //parse year
    strYear=exDateTime.substring(Sp2+1,Sp2+5);
    YearPattern=/^\d{4}$/;
    if (YearPattern.test(strYear))
        Cal.Year=parseInt(strYear,10);
    //end parse year
    //parse time

}
winCal=window.open("","DateTimePicker","toolbar=0,status=0,menubar=0,fullscreen=no,width=195,height=245,resizable=0,top="+cnTop+",left="+cnLeft);
docCal=winCal.document;
RenderCal();

}

function RenderCal() { var vCalHeader; var vCalData; var i; var j; var SelectStr; var vDayCount=0; var vFirstDay;

docCal.open();
docCal.writeln("<html><head><title>"+WindowTitle+"</title>");
docCal.writeln("<script>var winMain=window.opener;</script>");
docCal.writeln("</head><body background='"+ThemeBg+"' link="+FontColor+" vlink="+FontColor+"><form name='Calendar'>");

vCalHeader="<table border=1 cellpadding=1 cellspacing=1 width='100%' align=\"center\" valign=\"top\">\n";
//Month Selector
vCalHeader+="<tr>\n<td colspan='7'><table border=0 width='100%' cellpadding=0 cellspacing=0><tr><td align='left'>\n";
vCalHeader+="<select name=\"MonthSelector\" onChange=\"javascript:winMain.Cal.SwitchMth(this.selectedIndex);winMain.RenderCal();\">\n";
for (i=0;i<12;i++)
{
    if (i==Cal.Month)
        SelectStr="Selected";
    else
        SelectStr="";   
    vCalHeader+="<option "+SelectStr+" value >"+MonthName[i]+"\n";
}
vCalHeader+="</select></td>";
//Year selector
vCalHeader+="\n<td align='right'><a href=\"javascript:winMain.Cal.DecYear();winMain.RenderCal()\"><b><font color=\""+YrSelColor+"\"><</font></b></a><font face=\"Verdana\" color=\""+YrSelColor+"\" size=2><b> "+Cal.Year+" </b></font><a href=\"javascript:winMain.Cal.IncYear();winMain.RenderCal()\"><b><font color=\""+YrSelColor+"\">></font></b></a></td></tr></table></td>\n";   
vCalHeader+="</tr>";
//Calendar header shows Month and Year
if (ShowMonthYear)
    vCalHeader+="<tr><td colspan='7'><font face='Verdana' size='2' align='center' color='"+MonthYearColor+"'><b>"+Cal.GetMonthName(ShowLongMonth)+" "+Cal.Year+"</b></font></td></tr>\n";
//Week day header
vCalHeader+="<tr bgcolor="+WeekHeadColor+">";
for (i=0;i<7;i++)
{
    vCalHeader+="<td align='center'><font face='Verdana' size='2'>"+WeekDayName[i].substr(0,WeekChar)+"</font></td>";
}
vCalHeader+="</tr>";    
docCal.write(vCalHeader);

//Calendar detail
CalDate=new Date(Cal.Year,Cal.Month);
CalDate.setDate(1);
vFirstDay=CalDate.getDay();
vCalData="<tr>";
for (i=0;i<vFirstDay;i++)
{
    vCalData=vCalData+GenCell();
    vDayCount=vDayCount+1;
}
for (j=1;j<=Cal.GetMonDays();j++)
{
    var strCell;
    vDayCount=vDayCount+1;
    if ((j==dtToday.getDate())&&(Cal.Month==dtToday.getMonth())&&(Cal.Year==dtToday.getFullYear()))
        strCell=GenCell(j,true,TodayColor);//Highlight today's date
    else
    {
        if (j==Cal.Date)
        {
            strCell=GenCell(j,true,SelDateColor);
        }
        else
        {    
            if (vDayCount%7==0)
                strCell=GenCell(j,false,SaturdayColor);
            else if ((vDayCount+6)%7==0)
                strCell=GenCell(j,false,SundayColor);
            else
                strCell=GenCell(j,null,WeekDayColor);
        }       
    }                       
    vCalData=vCalData+strCell;

    if((vDayCount%7==0)&&(j<Cal.GetMonDays()))
    {
        vCalData=vCalData+"</tr>\n<tr>";
    }
}
docCal.writeln(vCalData);   
//Time picker

//end time picker
docCal.writeln("\n</table>");
docCal.writeln("</form></body></html>");
docCal.close();

}

function GenCell(pValue,pHighLight,pColor)//Generate table cell with value { var PValue; var PCellStr; var vColor; var vHLstr1;//HighLight string var vHlstr2; var vTimeStr;

if (pValue==null)
    PValue="";
else
    PValue=pValue;

if (pColor!=null)
    vColor="bgcolor=\""+pColor+"\"";
else
    vColor="";  
if ((pHighLight!=null)&&(pHighLight))
    {vHLstr1="color='red'><b>";vHLstr2="</b>";}
else
    {vHLstr1=">";vHLstr2="";}   

PCellStr="<td "+vColor+" width="+CellWidth+" align='center'><font face='verdana' size='2'"+vHLstr1+"<a href=\"javascript:winMain.document.getElementById('"+Cal.Ctrl+"').value='"+Cal.FormatDate(PValue)+"';"+vTimeStr+";window.close();\">"+PValue+"</a>"+vHLstr2+"</font></td>";
return PCellStr;

}

function Calendar(pDate,pCtrl) { //Properties this.Date=pDate.getDate();//selected date this.Month=pDate.getMonth();//selected month number this.Year=pDate.getFullYear();//selected year in 4 digits

if (pDate.getMinutes()<10)
    this.Minutes="0"+pDate.getMinutes();
else
    this.Minutes=pDate.getMinutes();

if (pDate.getSeconds()<10)
    this.Seconds="0"+pDate.getSeconds();
else        
    this.Seconds=pDate.getSeconds();

this.MyWindow=winCal;
this.Ctrl=pCtrl;
this.Format="ddMMyyyy";
this.Separator=DateSeparator;

}

function IncYear() { Cal.Year++;} Calendar.prototype.IncYear=IncYear;

function DecYear() { Cal.Year--;} Calendar.prototype.DecYear=DecYear;

function SwitchMth(intMth) { Cal.Month=intMth;} Calendar.prototype.SwitchMth=SwitchMth;

function GetMonthName(IsLong) { var Month=MonthName[this.Month]; if (IsLong) return Month; else return Month.substr(0,3); } Calendar.prototype.GetMonthName=GetMonthName;

function GetMonDays()//Get number of days in a month { var DaysInMonth=[31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]; if (this.IsLeapYear()) { DaysInMonth[1]=29; }
return DaysInMonth[this.Month]; } Calendar.prototype.GetMonDays=GetMonDays;

function FormatDate(pDate) { if (this.Format.toUpperCase()=="DDMMYYYY") return (pDate+DateSeparator+(this.Month+1)+DateSeparator+this.Year); else if (this.Format.toUpperCase()=="DDMMMYYYY") return (pDate+DateSeparator+this.GetMonthName(false)+DateSeparator+this.Year); else if (this.Format.toUpperCase()=="MMDDYYYY") return ((this.Month+1)+DateSeparator+pDate+DateSeparator+this.Year); else if (this.Format.toUpperCase()=="MMMDDYYYY") return (this.GetMonthName(false)+DateSeparator+pDate+DateSeparator+this.Year);
} Calendar.prototype.FormatDate=FormatDate;

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