function htmlEntities(source)
{
	reg = new RegExp("<");
	result = source.replace(reg, "&lt;");
	reg = new RegExp(">");
	result = result.replace(reg, "&gt;");
	reg = new RegExp("&");
	result = result.replace(reg, "&amp;");
	reg = new RegExp("@");
	result = result.replace(reg, "&at;");
	return result;
}