/*按比例生成缩略图*/
function DrawImage(MyPic,W,H){
  var flag=false;
  var image=new Image();
  image.src=MyPic.src;
  if(image.width>0 && image.height>0){
    flag=true;
    if(image.width/image.height>= W/H){
      if(image.width>W){  
        MyPic.width=W;
        MyPic.height=(image.height*W)/image.width;
      }
	  else{
        MyPic.width=image.width;  
        MyPic.height=image.height;
      }
    }
    else{
      if(image.height>H){  
        MyPic.height=H;
        MyPic.width=(image.width*H)/image.height;     
      }
	  else{
        MyPic.width=image.width;  
        MyPic.height=image.height;
      }
    }
  }
} 


     //加入收藏
   function AddFavorite(sURL, sTitle)
    {
        try
        {
            window.external.addFavorite(sURL, sTitle);
        }
        catch (e)
        {
            try
            {
                window.sidebar.addPanel(sTitle, sURL, "");
            }
            catch (e)
            {
                alert("加入收藏失败，请使用Ctrl+D进行添加");
            }
        }
    }
   //设为首页 
    function SetHome(obj,vrl)
    {
        try
        {        
                document.body.style.behavior='url(#default#homepage)';
                document.body.setHomePage(vrl);
        }
        catch(e){
                if(window.netscape) {
                        try {
                                netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect"); 
                        } 
                        catch (e) { 
                                alert("此操作被浏览器拒绝！\n请在浏览器地址栏输入“about:config”并回车\n然后将[signed.applets.codebase_principal_support]设置为'true'"); 
                        }
                        var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch);
                        prefs.setCharPref('browser.startup.homepage',vrl);
                 }
        }
    }
	
 
 
 
 <!--
function gotoURL() {
var Current = document.form1.menu1.selectedIndex;
//在新窗口中打开
window.open(document.form1.menu1.options[Current].value);
return false;
}
//-->