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Button's OnClick event can't call OnChange function of another DropDownList

Hi expert,
I am trying to use Classic version of CalendarXP (www.calendarxp.net/). Its ok. But I am facing another problem.
You know Classic version of CalendarXP has three DropDownLists(for Day, Month and Year) and one Button. When you click on button, a calendar pop is gererated. If you select a date from calendar pop, day will be shown on Day dropdownlist, month will be shown on Month DropDownList and year will be shown on year DropDownList. Each dropdownlist has onChange="if(self.gfPop)gfPop.updateHidden(this)". This function updates hidden text box, in where date is contained.
Problem is:
Before using CalendarXP control, I used a function  calculate(frmED,(passissDate_day.value),(passissDate_mon.value),(passissDate_year.value)) OnChange event of passissDate_year DropDownList. When I click on passissDate_year DropDownList, this OnChange function works. When I click on its button, calculate function doesnt work, but gfPop.updateHidden(this) works.


<select name="passissDate_year" class="listBox100" id="passissDate_year" style="width:60px;" onChange="calculate(frmED,(passissDate_day.value),(passissDate_mon.value),(passissDate_year.value))">
                  <script>document.write('<option value="-">year-');for(var i=1980;i<=2030;i++) {document.write('<option value="'+i+'">'+i)}</script>

<INPUT name="popcal4" width="10" onclick="if(this.blur)this.blur();var fm=this.form;if(self.gfPop){gfPop.fStartPop(fm.passissDate,fm.passexpDate, this);calculate(frmED,(passissDate_day.value),(passissDate_mon.value),(passissDate_year.value));}" type="button" value="..." class="vbtn">

Watch Question

Are you getting any javascript errors when you click that?  It's possible that this calculate function is already defined within the CalendarXP control.  Could you try renaming your function?

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