function setHomepage()
{
if (document.all)
    {
        document.body.style.behavior='url(#default#homepage)';
       document.body.setHomePage('http://www.vodone.com');

    }
    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 值该为true" );
         }
    }
    var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
	if(confirm("是否要将“http://www.vodone.com”设置为主页")){
    prefs.setCharPref('browser.startup.homepage','http://www.vodone.com');
	}
}
}