//字符串长度
var temp=true;
String.prototype.len = function()
{ 
	var str=this; 
	return str.replace(/[^\x00-\xff]/g, "**").length;
}
//裁剪两端空格
String.prototype.trim = function()
{ 
	return this.replace(/(^\s*)|(\s*$)/g, "");
}
//取得地址栏参数
var Request = 
{
	QueryString : function(item,paramurl)
	{  
		if(typeof(paramurl)!="string") paramurl=location.search;
		var svalue = paramurl.match(new RegExp("[\?\&]" + item + "=([^\&]*)(\&?)","i"));  
		var Qvalue = svalue ? svalue[1] : svalue;  
		if(Qvalue==null)
		{
			return "";  
		}  
		else  
		{  
			return Qvalue.trim();  
		} 
	} 
}
//取得顶窗口地址栏参数
var topRequest = 
{ 
	QueryString : function(item)
	{  
		return Request.QueryString(item,top.location.search);
	} 
}
//取得HTML元素
function $(node_id) 
{
	return document.getElementById(node_id);
}
//取得XMLHttp对象
function newXMLHttp()
{
	var XMLHttp=null; 
	if (window.XMLHttpRequest)
	{ 
		XMLHttp=new XMLHttpRequest();
	}
	if(XMLHttp==null && window.ActiveXObject)
	{
		var clsids = ["MSXML2.XMLHttp.5.0","MSXML2.XMLHttp.4.0","MSXML2.XMLHttp.3.0","MSXML2.XMLHttp.2.0","MSXML2.XMLHttp.1.0","MSXML2.XMLHttp","Microsoft.XMLHttp"]; 
		for(var i=0; i<clsids.length && XMLHttp == null; i++) 
		{
			try 
			{
				XMLHttp = new ActiveXObject(clsids[i]);
			} 
			catch(e)
			{}
		}
	}
	return XMLHttp;
}

//POST页面
function postHTML(URL,data,func) 
{

    try
    {
    
        var XMLHttp=newXMLHttp();
	//同步调用
	if(typeof(func)!="function")
	{
		XMLHttp.open("POST",URL, false);
		XMLHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); 
		XMLHttp.send(data);

		var result = XMLHttp.status;  
		var responseText=XMLHttp.responseText;
			
		if(result==200)
		{
			return responseText;
		}
		else
		{ 
			return false;
		}			
	}
	//异步调用
	else 
	{
	   temp=false;
		XMLHttp.onreadystatechange = function()
		{
			if (XMLHttp.readyState == 4) 
			{
			temp=true;
                		if (XMLHttp.status == 200) 
				{
                        		var responseText = XMLHttp.responseText ;
					func(responseText);
                		}
				else
				{
					func(false);
				}
			}

		}
		XMLHttp.open("POST",URL, true);
		XMLHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); 
		XMLHttp.send(data);			
	}
    } 
    catch(e){} 
}


//禁用F5,退格键
function forbidF5(event)
{
	var event = event || window.event;
	var evtnode=event.srcElement?event.srcElement:event.target;
	var key = event.keyCode || event.which;
	
	//116 F5 117 F6 8 BACKSPACE
	if(key==116 || key==117 || (key == 8 && evtnode.nodeName != "TEXTAREA" && evtnode.nodeName != "INPUT") )   
	{  
		eventstop(event);
	}  
	else
	{
		return true;
	}
}

function eventstop(event)
{
	try{event.keyCode=0;} catch(err) {}
	try{event.preventDefault();}catch(err){}
	try{event.stopPropagation();}catch(err){}
	try{event.returnValue = false;}catch(err){}
	try{event.cancelBubble = true;} catch(err){}
	return false;
}