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function checkEmail()
{
	var email = document.getElementById("email").value;
	if(email == "" || email == null) {
		document.getElementById("email_helper").innerHTML = "";
		return false;
	}

	var myreg = /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+/;
	if(!myreg.test(email)) {
		document.getElementById("email_helper").innerHTML = "请输入正确的邮箱";
	} else {
		document.getElementById("email_helper").innerHTML = "";
	}
}