<script language="JavaScript" type="text/JavaScript"> <!-- function CheckForm(e) { if( e.username.value=="" ){ alert('Sorry, your must give us a name.'); e.username.focus(); return false; } e.username.value += ""; return true; } --> </script> <form action="" method="post" id="myform" name="myform" onSubmit="return CheckForm(this)"> <input name="username" type="text"> <input name="B1" type="submit" value="submit"> </form>