function isMail(address)
{
if (address=="") return false
if (address.indexOf("@")==-1||address.indexOf("@")==0||address.indexOf("@")==address.length-1) return false
if (address.indexOf("@")!=address.lastIndexOf("@")) return false
if (address.indexOf(".")==-1||address.indexOf(".")==0) return false
return true
}

function Test_MessageForm(form1)
{
	if (!form1.user_name.value) {
	alert ("Please input your name") 
	form1.user_name.focus();
	return false;
	}
	if (!isMail(form1.user_mail.value)) {
	alert ("Please input your mail or mail is not valid") 
	form1.user_mail.focus();
	return false;
	}
	if (!form1.content.value) {
	alert ("Please input content") 
	form1.content.focus();
	return false;
	}
	return true;
}