function validate1(){
		var invalid = " "; // Invalid character is a space
		var f = document.form1;
		if (f.pick_up_day.value==f.returnn_day.value && f.pick_up_month.value==f.return_month.value && f.pick_up_year.value==f.returnn_year.value) 	{
			alert("Please select return date..");
			f.returnn_day.focus();
			return false;
		}
		return true;
	}