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.getAttribute("rel") == "blank")) 
     anchor.target = "_blank"; 
 } 
} 
window.onload = externallinks;

if (!window.XMLHttpRequest) {//IE6
	document.execCommand("BackgroundImageCache", false, true);
}

function addfav(favName,favUrl)
{
   try{window.external.AddFavorite(favUrl,favName);}
	catch(e){
		try{window.sidebar.addPanel(favName,favUrl,"");}
		catch(e){alert("使用快捷键 Ctrl+D 或 Cmd+D 来收藏此页！");}
	}
} 
function setHomepage(url){
	if (document.all){
        document.body.style.behavior='url(#default#homepage)';
		document.body.setHomePage(url);
    } else if (window.sidebar){
    	if(window.netscape){
			try {
            	netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");  
			}  catch (e) {
				alert( "该操作被浏览器拒绝，如果想启用该功能，请在地址栏内输入 about:config,然后将项 signed.applets.codebase_principal_support 值改为true" );  
			}
    	} 
    var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
    prefs.setCharPref('browser.startup.homepage',url);
	}
}