JS date range validation ??

[PHPycho]

I have two date field viz from-date and to-date
and i want to validate that from-date should be less than or equal to to-date
using javascript.
Note: date field should be in yy-mm-dd format
How is that possible ?
Please help me..
Thanks in advance..

[mrhoo]

if the Date fields validate subtract their Date objects-

if(new Date(from_date)-new Date(to_date)>0){
throw new Error('Time travel is not allowed');
}
else// to_date is after from_date

[7stud]

mrhoo's solution will not work for some users. Try this instead:

var from = "08-11-10";
var to = "07-11-10";

alert(isFirstEarlier(from, to));


function isFirstEarlier(d1, d2)
{
	var d1pieces = d1.split("-");
	var d2pieces = d2.split("-");
	
	var date1 = new Date(d1pieces[0], d1pieces[1], d1pieces[2]);
	var date2 = new Date(d2pieces[0], d2pieces[1], d2pieces[2]);
	
	return date1 <= date2;  //compares milliseconds since the epoch
}