<script type="text/javascript"> 
     function getIframeContent(){  //获取iframe中文档内容
             var doc; 
     
             if (document.all){//IE 
                     doc = document.frames["MyIFrame"].document; 
             }else{//Firefox    
                     doc = document.getElementById("MyIFrame").contentDocument; 
             } 
     
             return doc.body.innerHTML;
     
     } 
     </script>