// 发送短信的AJAX
var httpRequest;
function chkuser(users)
{   
	if(users.length>12)
	return;
	createHttp();
	var url;
	url="ajax/checkuser.asp?username="+users;
	httpRequest.open("GET",url,true);
	httpRequest.onreadystatechange=sendmsg;
	httpRequest.send(null);
	}
function createHttp()
{

	if(window.XMLHttpRequest)
	{
		httpRequest=new XMLHttpRequest;
		}
     else if(window.ActiveXObject){
		 try{
		 httpRequest= new ActiveXObject("Microsoft.XMLHTTP"); 
		 }
		 catch(e){}
		 try{
			 httpRequest=new ActiveXObject("Msxml2.XMLHTTP");
			 }
	     catch(e){}
		 }
     else
	 {
		 alert("创建失败");
		 }
}

function sendmsg()
{
	if(httpRequest.readyState==4)
	{   	
		if(httpRequest.status==200)
		{   
		 //alert(httpRequest.responseText);
			if(httpRequest.responseText=="true")
			{ 
               document.getElementById("chkmsg").innerHTML="<span style='color:#0c8703'>恭喜，该用户名可以注册</span>";
			}
			else if(httpRequest.responseText=="false")
			{
              document.getElementById("chkmsg").innerHTML="<span style='color:#F00'>对不起，该用户名已存在</span>";
			  document.getElementById("uname").focus();
			  return false;
			}
		}
	}
}