value of a textbox

am using a calender and the value of date, when i click on the calender, will be in the textbox "txtdate".
when i click "go To" i want to go to the chosen date for viewing the schedule of this day(chosen). the problem how to input the value of the textbox like a parameter for the changedate() function.

this is the code:

<input type="text" name="txtdate" value="#dateformat(searchdate,'dd/mm/yyyy')#" size="8">

<input type="image" src="calendar\ew_calendar.gif" alt="Pick a Date" onClick="popUpCalendar(this, this.form.searchdate,'dd/mm/yyyy');return false;" name="image">


<input type="submit" value="Go To" onClick="changedate('#here is my problem#')">

i need to put the parameter of the function changedate(the value written in the text "txtdate")

i dont know if i explained clearly my problem
thank you

This is actually a Javascript question. Someone here may be able to help but you might want to post this instead in the Javascript forum.

this *might* work..

<input type="submit" value="Go To" onClick="changedate(document.formName.txtdate.value)">