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<script type="text/javascript">
$('form').submit(function(){
	startDate = $("input[name='start_date']").val();
	endDate = $("input[name='end_date']").val();
	if( endDate < startDate ){
		alert("End Date must be larger than the Start Date. Please try again.");
        $.unblockUI();
		return false;
	}else{
		return true;
	}
});

</script>