用于自动添加Digg This!按钮的JavaScript

var main=document.getElementById("main"); 
var singlepost=false; 
var firstpost; 
var anchor; 
for(var i=0;i<main.childNodes.length;i++) 
{ 
  if(main.childNodes[i].className&&main.childNodes[i].className=="post") 
  { 
    var post=main.childNodes[i]; 
    if(!firstpost) 
    { 
      firstpost=post; 
    } 
    for(var j=0;j<post.childNodes.length;j++) 
    { 
      if(post.childNodes[j].className&&post.childNodes[j].className=="posthead") 
      { 
        var posthead=post.childNodes[j]; 
        if(posthead.childNodes[1]&&posthead.childNodes[1].tagName&&posthead.childNodes[1].tagName=="H2") 
        { 
          if(posthead.childNodes[1].childNodes[1]&&posthead.childNodes[1].childNodes[1].tagName&&posthead.childNodes[1].childNodes[1].tagName=="A") 
          { 
            anchor=posthead.childNodes[1].childNodes[1]; 
          } 
          else 
          { 
            anchor=posthead.childNodes[1].childNodes[0]; 
          } 
        } 
        else 
        { 
          anchor=posthead.childNodes[0].childNodes[0]; 
        } 
        anchor.style.fontSize="14pt"; 
        if(anchor.className&&anchor.className=="singleposttitle") 
        { 
          singlepost=true; 
        } 
      } 
    } 
  } 
} 
if(singlepost) 
{ 
  var postfoot=document.createElement("div"); 
  firstpost.appendChild(postfoot); 
  postfoot.className="postfoot"; 
  postfoot.innerHTML="<a href=\"http://del.icio.us/post?v=4&url="+encodeURIComponent(location.href)+"&title="+encodeURIComponent(document.title)+"\"><img src=\http://del.icio.us/favicon.ico\ alt=\"Add to del.icio.us\" border=\"0\"/><span>Add to del.icio.us</span></a>"; 
  postfoot.innerHTML+="<a href=\"http://digg.com/submit?phase=2&url="+encodeURIComponent(location.href)+"&title="+encodeURIComponent(document.title)+"\"><img src=\http://digg.com/favicon.ico\ alt=\"Digg This!\" border=\"0\"/><span>Digg This!</span></a>"; 
  postfoot.innerHTML+="<a href=\"http://www.facebook.com/share.php?u="+encodeURIComponent(location.href)+"\"><img src=\http://www.facebook.com/favicon.ico\ alt=\"Share on Facebook\" border=\"0\"/><span>Share on Facebook</span></a>"; 
  postfoot.innerHTML+="<a href=\"http://www.google.com/bookmarks/mark?op=edit&bkmk="+encodeURIComponent(location.href)+"&title="+encodeURIComponent(document.title)+"\"><img src=\http://www.google.com/favicon.ico\ alt=\"Google Bookmark This\" border=\"0\"/><span>Google Bookmark This</span></a>"; 
}