function checkEmail(){
	email=document.getElementById('email').value;
	if(isEmail(email)) {
		document.getElementById('email').style.backgroundColor="#ffffff";
		return true;
	}else{
		document.getElementById('email').style.backgroundColor="#fccae3";
		return false;
	}
}
function isEmail(v) {
	var reg = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	return reg.test(v);
}