打印网页时去掉页眉页脚

<script language="JavaScript">
var hkey_root,hkey_path,hkey_key
hkey_root="HKEY_CURRENT_USER"
hkey_path="//Software//Microsoft//Internet Explorer//PageSetup//"
//设置网页打印的页眉页脚为空
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>
<input type="button" value="清空页码" onclick=pagesetup_null()>
<input type="button" value="恢复页码" onclick=pagesetup_default()>