I was looking for a way to validate date in javascript the other day.... this is what I came up with. It takes advantage from Date() that returns empty object if an invalidate date is passed to it.

Not sure if there's a better way?

/* var from is a date in string format "10/30/2010 03:44:12" */

var timeFrom = new Date(from);

var fromMonth = from.substring(0,2) - 0;

var fromDay = from.substring(3,5) - 0;  

var fromYear = from.substring(6,10) - 0;  

if (timeFrom.getMonth()+1 != fromMonth || timeFrom.getDate() != fromDay || timeFrom.getFullYear() != fromYear) {

  $("div#error").text('Please enter a valid date range.');

}

I use it often but never seem to remember it, so it'd be good to document here somewhere.

<a class="action doSomething" id="777" onclick="javascript:return false;" href="#">

Once the link click is disabled, a javascript/jQuery script can hook to this tag and do its work. ie A background AJAX call, popup, etc.