js打印去掉页脚页眉问题

                  
 在网上找的js代码：
    <script type="text/javascript">
                  var hkey_root,hkey_path,hkey_key;
hkey_root="HKEY_CURRENT_USER";
hkey_path="\\Software\\Microsoft\\Internet Explorer\\PageSetup\\";

// 设置页眉页脚为空
function PageSetup_Null()
{
 try{
  var RegWsh = new ActiveXObject("WScript.Shell") ;
  hkey_key="header" ;
  RegWsh.RegWrite(hkey_root+hkey_path+hkey_key,"") ;
  hkey_key="footer" ;
  RegWsh.RegWrite(hkey_root+hkey_path+hkey_key,"") ;
  }
 catch(e){}
}

// 设置页眉页脚为默认值
function PageSetup_Default()
{
 try{
  var RegWsh = new ActiveXObject("WScript.Shell") ;
  hkey_key="header" ;
  RegWsh.RegWrite(hkey_root+hkey_path+hkey_key,"&w&b页码，&p/&P") ;
  hkey_key="footer" ;
  RegWsh.RegWrite(hkey_root+hkey_path+hkey_key,"&u&b&d") ;
  }
 catch(e){}
}function printPart(){
               
               var printArea = document.getElementById('selectid0');
               var iframe = document.createElement('IFRAME');
               var doc = null;
               iframe.setAttribute('style', 'position:absolute;width:0px;height:0px;left:-500px;top:-500px;');
               document.body.appendChild(iframe);
               doc = iframe.contentWindow.document;
               doc.write('<div>' + printArea.innerHTML + '</div>');
               doc.close();
               iframe.contentWindow.focus();
               PageSetup_Null();
               iframe.contentWindow.print();
               PageSetup_Default() ;
               if (navigator.userAgent.indexOf("MSIE") > 0)
               {
                    document.body.removeChild(iframe);
               }
         }
</script>
可是打印出来的还是有页眉和页脚，都是项目的路径，谁知道怎么回事？