function isblank(s) {
	for(var i = 0; i < s.length; i++) {
		var c = s.charAt(i);
		if((c != ' ') && (c != '\n') && (c != '\t')) return false;
	}
	return true;
}
function verify(f) {
	var msg;
	var empty_fields = "";
	var errors = "";

	for(var i = 0; i < f.length; i++) {
		var e = f.elements[i];

		if(((e.type == "text") || (e.type == "textarea")) && !e.optional) {
			if((e.value == null) || (e.value == "") || isblank(e.value)) {
				empty_fields += "\n" + e.name;
				continue;
			}
			if(e.numeric || (e.min != null) || (e.max != null)) {
				var v = parseFloat(e.value);

				if(isNaN(v) || ((e.min != null) && (v < e.min)) || ((e.max != null) && (v > e.max))) {
					errors += "- The field " + e.name + " must be a number";

					if(e.min != null) errors += " that is greater than " + e.min;
					if(e.max != null && e.min != null) errors += " and less than " + e.max;
					else if(e.max != null) errors += " that is less than " + e.max;
					errors += ".\n";
				}
			}
		}
	}

	if(!empty_fields && !errors) return true;

	msg = "The form was not submitted because of the following error(s).\n";
	msg += "Please correct these error(s) and re-submit.\n";

	if(empty_fields) {
		msg += "- The following required field(s) are empty:" + empty_fields + "\n";

		if(errors) msg += "\n";
	}

	msg += errors;
	alert(msg);
	return false;
}