【www.gdgbn.com--jquery】

<script type="text/网页特效">
     function lazyload(option){
      var settings={
       defobj:null,
       defheight:0
      };
      settings=$.extend(settings,option||{});
      var defheight=settings.defheight,defobj=(typeof settings.defobj=="object")?settings.defobj.find("img"):$(settings.defobj).find("img");
      var pagetop=function(){
       return document.documentelement.clientheight+math.max(document.documentelement.scrolltop,document.body.scrolltop)-settings.defheight;
      };
      var imgload=function(){
       defobj.each(function(){    
        if ($(this).offset().top<=pagetop()){
         var src2=$(this).attr("src2");
         if (src2){
          $(this).attr("src",src2).removeattr("src2");
         }
        }
       });
      };
      imgload();
      $(window).bind("scroll",function(){   
       imgload();
      });
     }
     lazyload({
      defobj:"#plist"
     })
    
     </script>

本文来源：http://www.gdgbn.com/wangyezhizuo/27352/