[ElForro]

I've fount this:

<script type="text/javascript">
function disable_enable(){
if (document.all || document.getElementById){
if (document.vbform.sbutton.disabled==false)
document.vbform.sbutton.disabled=true
else
document.vbform.sbutton.disabled=false
}
}
</script>

And then you need to add this to the submit button:

onclick="javascript:disable_enable()"

The problem with the "Quick Reply" is when you use AJAX, because the button will be disabled after your post... And if you set a minimun characters needed per post, the button will be still inactive after the alert... So, if anyone know how to use this Javascript would be nice... Especially for "unexpected" double clicks in the button...