document.onkeydown = function() 
   {
    //屏蔽F5和F11
    if ( window.event.keyCode == 116 || window.event.keyCode == 117 || window.event.keyCode == 122) 
    { 
		event.keyCode = 0;  
		return false;
    }
    //屏蔽 Alt+ 方向键 ←,屏蔽 Alt+ 方向键 →
    if ((window.event.altKey) 
    
     &&((window.event.keyCode == 37) || (window.event.keyCode == 39)))  
    {
		return false;
    }
    //屏蔽CTRL+N
    if (window.event.ctrlKey && window.event.keyCode == 78) 
    {
		return false;
    }
    //屏蔽CTRL+R
    if (window.event.ctrlKey && window.event.keyCode == 82)
    {
		return false;
    }
    //屏蔽CTRL+H
	if (window.event.ctrlKey && window.event.keyCode == 72)
	{
		return false;
	}
	//屏蔽CTRL+I
	if (window.event.ctrlKey && window.event.keyCode == 73)
	{
		return false;
	}
    //屏蔽SHIFT+F10
    if (window.event.shiftKey && window.event.keyCode == 121)
    {
		return false;
    }
    //非编辑区屏蔽BACK SPACE
    if (window.event.keyCode == 8)
    {    
     var  e= window.event.srcElement;
    if ((e.tagName.toUpperCase() != "INPUT" && e.tagName.toUpperCase() != "TEXTAREA") || (e.type.toUpperCase() != "TEXT" && e.type.toUpperCase() != "PASSWORD" && e.type.toUpperCase() != "TEXTAREA" && e.type.toUpperCase()!="FILE") ||(!e.isContentEditable) || (e.disabled) )
     {
		return false;
     }
    }
   }
   /*
   //非编辑区屏蔽右键菜单 
   document.oncontextmenu = function()
   {
    var  e= event.srcElement;
    if ((e.tagName != "INPUT" && e.tagName != "TEXTAREA") || (e.type.toUpperCase() != "TEXT" && e.type.toUpperCase() != "PASSWORD" && e.type.toUpperCase() != "TEXTAREA" && e.type.toUpperCase() != "FILE"))
    //if (e.tagName != "INPUT" || e.type != "text")
    {
		return false;
    }
   }
   */
 
 
 function delete_click()
 {
    return confirm("确定要删除吗？");
 }
 window.onload =function() 
{
	if(getcookie("height")!=null)
	document.body.scrollTop=getcookie("height");
}

window.onunload =function () 
{
	setcookie("height",document.body.scrollTop);
}
function getcookie(sName)
{
	var aCookie = document.cookie.split("; ");
	for (var i=0; i < aCookie.length; i++)
	{
		var aCrumb = aCookie[i].split("=");
		if (sName == aCrumb[0]) 
		return unescape(aCrumb[1]);
	}
	return null;
}

function setcookie(sName, sValue)
{
	date = new Date();
	date.setTime(date.getTime()+5000);  //5 second
	document.cookie = sName + "=" + escape(sValue) + "; expires=" + date.toGMTString();
}



 

function openwin(Name)
{ 
	winSub=window.open(Name,'aaa','width=780,center=1,help=no,scrollbars=1,maxnimize=yes') ;
	winSub.focus();
} 

function get_cookie(Name)
{ 
	var search = Name + "=" 
	var returnvalue = ""; 
	if (document.cookie.length > 0) 
	{ 
		offset = document.cookie.indexOf(search) ;
		if (offset != -1) 
		{ 
			offset += search.length 
			end = document.cookie.indexOf(";", offset); 
			if (end == -1) 
			end = document.cookie.length; 
			returnvalue=unescape(document.cookie.substring(offset, end)) ;
			alert(returnvalue);
		} 
	} 
	return returnvalue; 
} 

 function loadpopup(Name,id)
{	
	if (get_cookie(id)=='')
	{
		openwin(Name) 
		document.cookie=id+"=yes" 
	} 
}

function windowclose(id)
{
	document.cookie(id)=='';
}
 
 /*
 function   window.onunload()   
  {   
      if   (event.clientX   <   0   &&   event.clientY   <   0)   
          window.showModalDialog('~/logout.aspx' );   
  } 
  */
  
  function GetXmlHttpObject() 
{
    //创建XMLHttpRequest对象来发送和接收HTTP请求与响应
    xmlHttpObj = null;
    try 
    {
        // FireFox Opera 8.0+ Safari
        xmlHttpObj = new XMLHttpRequest();
        if(xmlHttpObj.overrideMimeType) 
        {
            xmlHttpObj.overrideMimeType('text/xml');
        }
    } 
    catch(e) 
    {
        // IE
        try 
        {
            xmlHttpObj = new ActiveXObject("Msxml2.XMLHTTP");
        } 
        catch(e) 
        {
            xmlHttpObj = new ActiveXObject("Microsoft.XMLHTTP");
        }
    }
    return xmlHttpObj;
}
 
function StateChanged() 
{
    if(___xmlHttp.readyState == 4) 
    { 
        if(___xmlHttp.status == 200) 
        {
        } 
        else 
        {
        }
    }
}
 
var ___xmlHttp=null;
function ClearSession() 
{
    
    if(___xmlHttp==null)
        ___xmlHttp = GetXmlHttpObject();
    if(___xmlHttp == null) 
        return false;
        
    var url = "?___command=ClearSession&___clientRandom=" + Math.random();
 
    ___xmlHttp.open("GET", url, true);
    ___xmlHttp.onreadystatechange = StateChanged;
    ___xmlHttp.send(null);
    
}
 
window.onbeforeunload = function() 
{   
      var n = window.event.screenX - window.screenLeft; 
      var b = n > document.documentElement.scrollWidth-20; 
      if(b && window.event.clientY < 0 || window.event.altKey)   
      {   
          ClearSession(); 
      }   
}