function changeValidateImage()
{
 var time=new Date();
 var vif=document.getElementById('vi');
 vif.src='ValidateImg.aspx?time='+time.getMilliseconds();
}
function logonValidate()
{
var uid=document.getElementById("uid").value;

var pwd=document.getElementById("pwd").value;

var ivcode=document.getElementById("vcode").value;

if(uid.length==0&&pwd.length==0)
{
   alert("请输入用户名和密码!");
   return false;
}
if(uid.length==0&!pwd.length==0)
{
   alert("请输入您的用户名!");
   return false;
}
if(!uid.length==0&pwd.length==0)
{
   alert("请输入您的密码!");
   return false;
} 
if(ivcode.length==0)
{
   alert("请输入验证码!");
   return false;
} 
 var inf=document.getElementById("info");
 inf.style.display="block";
 inf.innerHTML="正在登陆....";
 request.open("Post","ServerLogon.aspx",true);
 request.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
 request.onreadystatechange=logonHelper;
 request.send("action=lg&uid="+uid+"&pwd="+pwd+"&ivcode="+ivcode);  
}

function logonHelper()
{
    if(request.readyState==4)
    {
        if(request.status==200)
		{
			if(request.responseText=="suc")
		    {
                window.location="loginMain.html";
		    }
		    else
		    {
                document.getElementById("info").innerHTML=request.responseText;
            }
        }
        else
        {
           alert("出现未知错误,请联系网站负责人！");
        }
    }
}
 
function openUrl()
{
   window.open("MailDescribe.htm","_blank","width=650,height=650,top=30,left=350");
}
function logoutProxy()
{
    
     var inf=document.getElementById("info");
     inf.innerText="正在注销....";
     request.open("Post","AsynOp.aspx",true);
     request.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
     request.onreadystatechange=function()
     {
         if(request.readyState==4)
		 {   
             if(request.status==200)
                window.location="loginMain.html";
             else
                alert(request.statusText);
         }
     };
     request.send("action=lo");
}