function validate(thisform) {
	with (thisform) {
		if (validate_required(qty,"Please enter quantity")==false) {
			qty.focus();
			return false
		}
	}
}

function validate_required(field,alerttxt) {
	with (field) {
		if (value==null||value=="") {
			alert(alerttxt);
			return false
		} else {
			return true
		}
	}
}