Calendar view in javascript

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Javascript

i have the code of iframe which will be stored in the body tag i.e

<iframe width=174 height=189 name="gToday:normal:agenda.js" id="gToday:normal:agenda.js" src="/approot/Datepicker/ipopeng.htm" scrolling="no" frameborder="0" style="visibility:visible; z-index:999; position:absolute; top:-500px; left:-500px;"><br />
</iframe>

and then i want to call the date with the code in the javascript such as

<a href="javascript:void(0)" onclick="if(self.gfPop)gfPop.fPopCalendar(document.formbean.property);return false;" ><img name="popcal" align="absmiddle" src="/approot/Datepicker/calbtn.gif" width="34" height="22" border="0" alt=""></a>

but i am not able to view the calendar when pressing the icon
pls help me

I am Using JSP with Javascript

if any other way to view pls give me the code or suggest me what to do

For Further details

I had a dynamically incremented textbox using javascript insertRow() function so i want a calendar icon beside that and when i click on that icon it must show the calendar and after selecting the date it must print it on the textbox
then i want to pass that data to the database.