// JavaScript Document

<!--树菜单开始-->
if (document.getElementById){ 
document.write('<style type="text/css">\n')
document.write('.submenu{display: none;}\n')
document.write('</style>\n')
}

function SwitchMenu(obj,aa){

	if(document.getElementById){
		var el = document.getElementById(obj);
		var ar = document.getElementById("masterdiv").getElementsByTagName("span"); 
		if(el != null){
			if(el.style.display != "block"){ 
				for (var i=0; i<ar.length; i++){
					if (ar[i].className=="submenu") 
					ar[i].style.display = "none";
				}
				el.style.display = "block";
				//aa.className="menutitle2";
				var mr = document.getElementById(aa);
				mr.className="menutitle1";
	
			}else{
				el.style.display = "none";
				//aa.className="menutitle1";
		        var mr = document.getElementById(aa);
				mr.className="menutitle2";
			}
		}	
	}
}
<!--树菜单结束-->

<!--iframe高度自适应-->
function setIFrameHeight(_iframeId)
{    
    if (window.addEventListener) //firefox
     {          
        var _action=function()
         {       
            var _iframe=document.getElementById(_iframeId);
            if (!_iframe) return;
             _iframe.height=_iframe.contentDocument.body.scrollHeight;
             _iframe.onload=function()
             {
                this.height=this.contentDocument.body.offsetHeight+16;
             }
         }
         window.addEventListener("load", _action, false);
     }
    else if (window.attachEvent) //IE
     {
        var _action=function()
         {        
            if (!document.getElementById(_iframeId)) return;
             document.getElementById(_iframeId).height=document.frames[_iframeId].document.body.scrollHeight;
             document.getElementById(_iframeId).onreadystatechange=function()
             {
                if (this.readyState=="complete")
                 {
                    this.height=document.frames[_iframeId].document.body.scrollHeight;
                 }
             }
         }
         window.attachEvent("onload", _action);
     }
}
<!--iframe高度自适应end-->


<!--target弹出窗口属性设置-->
function externalLinks() { 
	if (!document.getElementsByTagName) return; 
	var anchors = document.getElementsByTagName("a"); 
	for (var i=0; i<anchors.length; i++) { 
		var anchor = anchors[i]; 
		if (anchor.getAttribute("href") && 
			anchor.getAttribute("rel") == "external") 
		  anchor.target = "_blank"; 
	} 
} 
window.onload = externalLinks; 
<!--target弹出窗口属性设置end-->