function userreg()
{
	if (formreg.usernameemail.checked)
		{
			if (formreg.email.value=="")
				{
				alert("请先输入E-mail");
				formreg.email.focus();
				formreg.usernameemail.checked=false;
				return false;
				}
			else
				{
				formreg.username.value=formreg.email.value
				formreg.username.readOnly=true
				}
		}
	else
		{
			formreg.username.value=""
			formreg.username.readOnly=false
		}
}


	function Submit1(){
		
		if (form1.username.value=='') {
                window.alert ("请输入用户名 ！")
                form1.username.focus(); 
                return false;
                }
                if (form1.password.value=='') {
                window.alert ("请输入密码 ！")
                form1.password.focus(); 
                return false;
                }	
        form = form1;
		var validateUrl = loginUrl + "?password=" + form.password.value + "&userName=" + form.username.value;
        req.open("GET", validateUrl, true);
        req.onreadystatechange = loginValidateCallback;
        req.send(null);
                //form1.submit();
	 }
	 function Submit2(){
		
		
		if (formreg.email.value=='') {
                	window.alert ("请输入Email ！")
                	formreg.email.focus(); 
                	return false;
                }
                if(!isEmail(formreg.email.value)){
			formreg.email.focus();
			alert("请正确填写您的E-mail地址。");
			return false;
		}
		
				
               	if (formreg.username.value=='') {
                window.alert ("请输入用户名 ！")
                formreg.username.focus(); 
                return false;
                }
                if (formreg.username.value.length<3) {
                window.alert ("用户名必须不小于3个字符 ！")
                formreg.username.focus(); 
                return false;
                }
                if (formreg.username.value.length>15) {
                window.alert ("用户名不能超作15个字符 ！")
                formreg.username.focus(); 
                return false;
                }	
                if (formreg.password.value=='') {
                window.alert ("请输入密码 ！")
                formreg.password.focus(); 
                return false;
                }	
                if (formreg.passwordyn.value=='') {
                window.alert ("请输入确认密码 ！")
                formreg.passwordyn.focus(); 
                return false;
                }	
                if(formreg.password.value!=formreg.passwordyn.value){
			formreg.password.focus();
			alert("两次输入密码不相符");
			return false;
		}
		form = formreg;
		var validateUrl = regUrl + "?email=" + form.email.value + "&userName=" + form.username.value;
        req.open("GET", validateUrl, true);
        req.onreadystatechange = regValidateCallback;
        req.send(null);
                //formreg.submit();
	 }
	function isEmail(email){ 
	 	invalidChars = " /;,:{}[]|*%$#!()`<>?"; 
		if (email == "") 
	  	return false;  
		for (i=0; i< invalidChars.length; i++){ 
	  	badChar = invalidChars.charAt(i) 
	  	if (email.indexOf(badChar,0) > -1) 
	   		return false; 
	  } 
		atPos = email.indexOf("@",1) 
		if (atPos == -1)
	  	return false; 
		if (email.indexOf("@", atPos+1) != -1)  
	  	return false;  
	 	periodPos = email.indexOf(".",atPos) 
		if(periodPos == -1)
	  	return false; 
		if ( atPos +2 > periodPos)
	  	return false; 
	 	if ( periodPos +3 > email.length)
	  	return false;
	 	return true; 
	}
	
    function regValidateCallback() {
        if (req.readyState == 4) {
            if (req.status == 200) {
                var node = req.responseXML.getElementsByTagName("message")[0].childNodes[0];
                if(node) {
                    if(node.nodeValue == "valid")
                        formreg.submit();
                    else if(node.nodeValue == "email")
                        alert("E-mail已存在，请选择其他E-mail");
                    else if(node.nodeValue == "userName")
                        alert("用户名已存在，请选择其他用户名");
                    else if(node.nodeValue == "userName,email")
                        alert("用户名已存在，请选择其他用户名\nE-mail已存在，请选择其他E-mail");
                }
            }
        }
    }
    
    function loginValidateCallback() {
        if (req.readyState == 4) {
            if (req.status == 200) {
                var node = req.responseXML.getElementsByTagName("message")[0].childNodes[0];
                if(node) {
                    if(node.nodeValue == "valid")
                        form1.submit();
                    else if(node.nodeValue == "invalid")
                        alert("用户名或密码错误");
                }
            }
        }
    
    }