function validateform(f)
{
	var error = "";
	if (f.txtEmail.value == "") 
	{
		error += (error == "" ? "" : "\n") + "- Email";
	}
	else
	{
		emailregex = /\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/i;
		if (emailregex.test(f.email.value) == false) error += (error == "" ? "" : "\n") + "- Email invalid format";
	}
	if (f.txtFname.value == "") error += (error == "" ? "" : "\n") + "- First Name";
	if (f.txtFname.value == "") error += (error == "" ? "" : "\n") + "- Last Name";
	if (f.txtCity.value == "") error += (error == "" ? "" : "\n") + "- City";

	if (error != "")
	{
		alert("The following fields are required:\n\n" + error);
		return false;
	}
	return true;
}