function popup(width, height, url) {
features="toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no";
features=features + ",width=" + width + ",height=" + height;
window.open(url,'',features);
}

function isNumber(form){
	if (isNaN(parseInt(form.qty.value))){
		alert ("Quantity field must be a number");
		return false;
	}
return true;
}