function js_post()
{
  var $ = document.getElementById("fuwu");
  if($.value=="")
  {
    alert("Please input Subject!");
    $.focus();
    return false;
  }
   $ = document.getElementById("mingcheng");
  if($.value=="")
  {
    alert("Please input company name!");
    $.focus();
    return false;
  }
  $ = document.getElementById("username");
  if($.value=="")
  {
    alert("Please input contact person!");
    $.focus();
    return false;
  }
  $ = document.getElementById("telphone");
  if($.value=="")
  {
    alert("Please input telphone");
    $.focus();
    return false;
  }
  $ = document.getElementById("email");
  if($.value=="")
  {
    alert("Please input e-mail");
    $.focus();
    return false;
  }
  if(!isEmail($.value))
  {
    alert("E-mail error!");
    $.focus();
    $.select();
    return false;
  }
  $ = document.getElementById("content");
  if($.value=="")
  {
    alert("Please input message!");
    $.focus();
    return false;
  }
}
function isEmail(s)
{
  var patrn=/^\w+((-\w+)|(\.\w+))*\@\w+((\.|-)\w+)*\.\w+$/;
  if (!patrn.exec(s)) return false
  return true
}