function qingkong()
{ 
    var txts=document.getElementsByTagName("input");
    for(var i=0;i<txts.length;i++)
    {
        if(txts[i].type=="text")
        {
            txts[i].value="";
        }
        if(txts[i].type=="password")
        {
            txts[i].value="";
        }
    }       
}
function demo()
{
    var tsx=document.getElementsByTagName("textarea");
    for(var i=0;i<tsx.length;i++)
    {
        this[i].value="";
    }
}
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"); 
        } 

    } 

} 
function SetHome(obj,vrl){ 
    try
    { 
         obj.style.behavior='url(#default#homepage)';obj.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]的值设置为'true',双击即可。"); 
             } 
             var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components.interfaces.nsIPrefBranch); 
             prefs.setCharPref('browser.startup.homepage',vrl); 
             } 
        } 
} 
function ResizeImages()
{
   var myimg,oldwidth,oldheight;
   var maxwidth=550;
   var maxheight=880
   var imgs = document.getElementById('article').getElementsByTagName('img');   //如果你定义的id不是article，请修改此处

   for(i=0;i<imgs.length;i++){
     myimg = imgs[i];

     if(myimg.width > myimg.height)
     {
         if(myimg.width > maxwidth)
         {
            oldwidth = myimg.width;
            myimg.height = myimg.height * (maxwidth/oldwidth);
            myimg.width = maxwidth;
         }
     }else{
         if(myimg.height > maxheight)
         {
            oldheight = myimg.height;
            myimg.width = myimg.width * (maxheight/oldheight);
            myimg.height = maxheight;
         }
     }
   }
}