用JS去掉打印的页眉页脚

<script language="JavaScript">
var hkey_key;
var hkey_root="HKEY_CURRENT_USER";
var hkey_path="\\Software\\Microsoft\\Internet Explorer\\PageSetup\\";
//设置网页打印的页眉页脚为空
function pagesetup_null()
{    

    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,"");

}

//设置网页打印的页眉页脚为默认值
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){}
}
</script>