var objXMLHttpRequest;
		  if (window.ActiveXObject){
					objXMLHttpRequest=new ActiveXObject("Microsoft.XMLHTTP");
		  }else if (window.XMLHttpRequest){
				  objXMLHttpRequest=new XMLHttpRequest();
		  }
  

    function chklogin(){
      var username = document.getElementById("userName").value;
      var pw = document.getElementById("PW").value;   
      var param = "ajax";  
	  var method = "nk";
       if (username == ""){
          alert("对不起,用户名不能为空!");
          document.getElementById("userName").focus();
       }else if (pw == ""){         
          alert("对不起,密码不能为空!");
          document.getElementById("PW").focus();
       }else{
       	         objXMLHttpRequest.open("post","../checklogin.php?param="+param+"&method="+method,true);
 			     objXMLHttpRequest.setRequestHeader("Content-type","application/x-www-form-urlencoded"); 			    
 			     objXMLHttpRequest.send("userName="+ username + "&PW=" +pw);
 			     objXMLHttpRequest.onreadystatechange= callback;				     
       }
    }
    	
  function callback(){
 		if(objXMLHttpRequest.readyState == 4 && objXMLHttpRequest.status == 200){    
		                    					       
			           if(objXMLHttpRequest.responseText == "0"){		
						  
			           	     document.getElementById("MySAMP").innerHTML =loginwindow();
          	    		       	   		 				    
			           }else{
			           	     document.getElementById("MySAMP").innerHTML = location='games.php';
			           }	    
 		  }

  }
  function focusDe(){
					if(document.getElementById("tex").value=="请输入游戏名称")	{
						document.getElementById("tex").value="";	
					}
					}
					  function focusDee(){
					if(document.getElementById("tex").value=="请输入经验心得标题")	{
						document.getElementById("tex").value="";	
					}
					}