function login(){
var u=document.getElementById('email');
var p=document.getElementById('password');
var y=document.getElementById('y');
	if(u.value.length==0){
	alert('邮箱地址不能为空！');
	u.focus();
	return false;
	}
	if(p.value.length==0){
	alert('密码名不能为空！');
	p.focus();
	return false;
	}
	if(y.value.length==0){
	alert('验证码名不能为空！');
	y.focus();
	return false;
	}
location.href='user_login_check.php?email='+u.value+'&password='+p.value+'&y='+y.value+'';
}
//TAB
function tab(n){
	if(n=='1'){
	document.getElementById('tab1').className="t_m1"; 	
	document.getElementById('tab2').className="t_m22"; 
	document.getElementById('tab111').style.display="inline"; 
	document.getElementById('tab222').style.display="none"; 
	}
	if(n=='2'){
	document.getElementById('tab1').className="t_m2"; 	
	document.getElementById('tab2').className="t_m21"; 	
	document.getElementById('tab111').style.display="none"; 
	document.getElementById('tab222').style.display="inline"; 
	}
}