javascript datediff of 2 textbox dates

I have 2 textboxes that I want to enter dates into and a third textbox I want to automatically enter the number of days (datediff +1) difference of the 2 dates. I need to NOT have a postback for this and want to accomplish it in javascript. Would need it to evaluate if the text in the textboxes are actual dates (isdate()) and perform the calculation when leaving either textbox and fill in the third textbox with the number. Any help would be greatly appreciated!  
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SwapnilSoftware ArchitectCommented:
Hi Cubbybulin,

        There are multiple ways available. Please check below for solution.


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CubbybulinAuthor Commented:
I am trying to use this solution from the link you provided. I am not sure how to invoke it though when a date is entered into either of the two textbox's (on textchanged) and then enter the value into the third textbox.

 <script type="text/javascript" src="date.js"></script>
<script type="text/javascript">                
var minutes = 1000*60;                
var hours = minutes*60;                
var days = hours*24;                  
var foo_date1 = getDateFromFormat("02/10/2009", "M/d/y");                
var foo_date2 = getDateFromFormat("02/12/2009", "M/d/y");                
var diff_date = Math.round((foo_date2 - foo_date1)/days);                
alert("Diff date is: " + diff_date );         </script>
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