function estimateShipping(zipcodeObj) {
		var zipcode = zipcodeObj.value;
		var url = "Popups/ShippingEstimate.aspx?zipcode=" + zipcode;
		
		// Make sure the entered a zipcode
		if (zipcode.length == 0) {
			alert("You must enter your shipping zipcode in order estimate shipping.");
			return;
		}
		
		// Open the shipping estimate window
		window.open(url,'_blank','toolbar=no,scrollbars=yes,location=no,directories=no,status=no,menubar=no,copyhistory=0,width=400,height=400,top=100,left=100');
	}