Apache Friends Support Forum

Hello,
My problem is for a form made in javascript.
When I submit the data it tells me to download a file.

This is the source code:

<script language=javascript>
function submit_form()
{
document.forms['connection'].submit();
}
</script>

<form method="post" action="" name="connection">
<img class="logo" src="images/security.png" border=0><h1><?php echo $trans['connect'];?></h1>
<div class="login"><?php echo $trans['login'];?> :</div><div class="pwd"><?php echo $trans['pwd'];?> :</div>
<div class="logininput"><input type="text" id="login" name="login"></div>
<div class="pwdinput"><input type="password" id="pwd" name="pwd"></div>
<div class="boxbtn valid"><a href="javascript:submit_form()">

Thanks