rpLogin();
function checkHasLogin(url)
{
	http_request=false;
	if(window.XMLHttpRequest)
		{	
			http_request=new XMLHttpRequest();
			if(http_request.overrideMimeType)
			{
				http_request.overrideMimeType("text/html");
			}
		}
		else if(window.ActiveXObject)
		{
			try{
				http_request=new ActiveXObject("Msxml2.XMLHTTP");
			}catch(E){
				try{
					http_request=new ActiveXObject("Microsoft.XMLHTTP");
				}catch(e){}
				}
		}
		if(!http_request)
		{
			window.alert("不能创建XMLHttpRequest对象实例.");
			return false;
		}
		http_request.onreadystatechange=checkResult;
		http_request.open("GET",url,true);
		http_request.send(null);
	}
	function checkResult()
	{
		if(http_request.readyState==4)
		{
			if(http_request.status==200)
			{
			   var str=	http_request.responseText;
			  rpLoginContent(str);
			}
			else
				{
					alert("您所请求的页面不正常");
				}
		}
	}

	function rpLogin()
	{
		
		 checkHasLogin("islogin.php?"+Math.random());
	}
String.prototype.Trim = function() {  
    var m = this.match(/^\s*(\S+(\s+\S+)*)\s*$/);  
    return (m == null) ? "" : m[1];  
  }
	function rpLoginContent(str)
	{
		var content='';
	if(str.Trim()=="")
		{
			if(false)
			{
			content="<div id='logintitle' >用户登录</div>";
			content=content+"<div id=loginmain>";
			content=content+"<form action='reg.php' name='left_log' method='post'>";
			content=content+"<div id='loginid'>用户：<input type=text name='loginid' style='width=145;height=20' size='14'></div>";
			content=content+"<div id='loginpsd'>密码：<input type=password name='psd' style='width=145;height=20' size='14'></div>";
			content=content+"<div id='loginbutton'>";
			content=content+"<input type='image'  name='imgBtn' src='images2/login.gif' onClick='this.form.submit()'>&nbsp;<input type='image'  name='imgBtn' src='images2/reg.gif' onClick='GoToReg()'>";
			content=content+"</div>";
			content=content+"</form>";
			content=content+"</div>";
			}
			else
			{
			content=content+"	<form action='reg.php' style='padding:0px;margin:0px' name='form1' method='post'>";
			content=content+"		<table width='100%' height='90px' bgcolor='#4499c2'  cellpadding='0px' cellspacing='0px' border='0px'>";
			content=content+"		<tr><td colspan=2  align='center' ><b>用户登录</b></td></tr>";
			content=content+"		<tr><td align='right' >用户名：</td><td><input class='tbx' type='text' name='loginid' style='width:100px' ><td></tr>";
			content=content+"		<tr><td align='right' >密码：</td><td><input class='tbx' type='password' name='psd' style='width:100px' ><td></tr>";
			content=content+"		<tr><td colspan=2  align='right' ><a href='/findmypassway.php'>找回密码>></a></td></tr>";
			content=content+"		</table>";
			content=content+"		<table width='100%' height='26px' cellpadding='0px' cellspacing='0px' border='0px'>";
			content=content+"		<tr bgcolor='#2b6bb3'><td align='center' width='50%'  ><input type=submit class='loginsubmit' value='登录'></td><td align='center'><input type='button' class='loginsubmit' onclick=\"window.top.location='reg_new.php' ;\" value='注册'></td></tr>";
			content=content+"		</table>";
			content=content+"	</form>";
			}
			
		}
	else
		{
			if(false)content="<table height=80px width=80% align=center ><tr><td valign=middle align=center style='font-size:12px;' ><b><a href='/lyncml/index.php' style='text-decoration:none;font-size:13px;color:#8c1821'>"+str+"</a></b> 已经登陆。</td></tr></table>" ;
			else{content="<br><br><br><a style='text-decoration:none;font-size:13px;color:#4498c3' href='/lyncml/index.php'><b>"+str+"</b></a>&nbsp;已登录 &nbsp;<a href='/bbs3/login.php?action=quit&verify=af79be41&logouturl=/index.htm'>退出</a>";}
			
		}
		 //document.writeln(content);
		  document.getElementById('login').innerHTML=content;
		 
	}