function login_form(){
	var isemail = /^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/;
	var check=0;
	var msg="系统提示:\n";	
	var username = document.getElementById("username").value;
	var email = username;
	var password =document.getElementById("password").value;
	var verifycode  = document.getElementById("verifycode").value;

	var url = '/login/action.php?action=login';
	var pars = 'username=' + username + '&password=' + password+ '&verifycode=' + verifycode+ '&email=' + email;
	var myAjax = new Ajax.Request(
	url, 
	{
	  method: 'post', 
	  parameters: pars, 
	  onComplete: function(originalRequest){
		if (originalRequest.responseText == '0')
			alert("系统提示:\nEmail或密码错误");
		else if (originalRequest.responseText == '1'){
			window.location.reload();
		}	
		else if (originalRequest.responseText == '2'){
			alert("系统提示:\n验请检查您的的验证码是否匹配");
			document.getElementById('verimg').src = "/community/verify.php?color=254,254,254&rnd="+Math.random();
		}
		else {return;}
	  } 

	});

}