function Juge(theForm)
 {
  if (theForm.users.value == "")
  {
    alert("User name can not be empty!");
    theForm.users.focus();
    return (false);
  }
    if (theForm.pasds.value == "")
  {
    alert("Password can not be empty!");
    theForm.pasds.focus();
    return (false);
  }
    if (theForm.yzm.value == "")
  {
    alert("Code can not be empty!");
    theForm.yzm.focus();
    return (false);
  }
  }

document.write("<form name=form1 method=post action='/vip/userok.asp' onSubmit='return Juge(this)'><table border=0 align=center cellpadding=3 cellspacing=0><tr><td><div align=center ><font color=#000000>Username：</font></div></td><td><div align=center ><input name=users type=text  id=users size=10 /></div></td><td rowspan='2'><input type=image name=imageField src='/vip/img/dl.jpg'></td></tr><tr><td><div align=center><font color=#000000>Password：</font></div></td><td><div align=center ><input name=pasds type=password id=pasds size=10 /></div></td></tr><tr><td colspan=3><div align=center ></div></td></tr></form></table>");