Porque no me funciona???

[syntex]

Hola otra vez,

Porque este script, no me funciona??

<script type="application/javascript">

var texts = document.forms[0].elements[0].value;
document.write(texts);

function Grande(name)
{
.....
.....
}
</script>
<form action="" method="post">
<input type="text" name="user" value="<? echo $crypt->decode(stripslashes($_POST[user])); ?>" size="20" maxlength="50" class="form_panel_left_negro" onclick="Grande('user');" />
</form>