var xmlHttp

function showHint(str)
{ 
	//alert(str);
	var val = document.getElementById(str).value;
	val = encodeURI(val);
	//alert(val);
	if (str.length > 0)
	{ 
		apid.innerHTML="验证昵称....";
		var url="checkap.asp?title=" + val ;
		url=url+"&sid="+Math.random();
		xmlHttp=GetXmlHttpObject(stateChanged);
		xmlHttp.open("GET", url , true);
		xmlHttp.send(null);
	} 
	else
	{ 
		document.getElementById("apid").innerHTML=""
	} 
} 

function stateChanged() 
{ 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	{ 
		if (xmlHttp.responseText =="true")
		{
			document.getElementById("apid").innerHTML= "  公寓填写正确！";
		}
		else if(xmlHttp.responseText =="false")
		{
			document.getElementById("apid").innerHTML="<font color='red'>&nbsp;&nbsp;对不起,此公寓不存在，请先<a href='apartment.asp' target='_blank'>添加该公寓</a>！</font>";
			return false;

		}
		else
		{
			document.getElementById("apid").innerHTML="&nbsp;&nbsp;验证失败!!";
			return false;
		}
	} 
	else
		return false;

	return true;
} 

function GetXmlHttpObject(handler)
{ 
	var objXmlHttp=null

	if (navigator.userAgent.indexOf("Opera")>=0)
	{
		alert("This example doesn't work in Opera") 
		return; 
	}
	if (navigator.userAgent.indexOf("MSIE")>=0)
	{ 
		var strName="Msxml2.XMLHTTP"
		if (navigator.appVersion.indexOf("MSIE 5.5")>=0)
		{
			strName="Microsoft.XMLHTTP"
		} 

		try
		{ 
			objXmlHttp=new ActiveXObject(strName)
			objXmlHttp.onreadystatechange=handler 
			return objXmlHttp
		} 
		catch(e)
		{ 
			alert("Error. Scripting for ActiveX might be disabled") 
			return 
		} 
	} 
	if (navigator.userAgent.indexOf("Mozilla")>=0)
	{
		objXmlHttp=new XMLHttpRequest()
		objXmlHttp.onload=handler
		objXmlHttp.onerror=handler 
		return objXmlHttp
	}
}