Form error message

Hi,

I would like to change something on the form module.

My goal is that if a user submits the form before all fields are filled the error messages appear at the top all in one div.

Current situation (standard) is:

You need to fill in the field 'name'
Name [ ]

You need to fill in the field 'email'
Email [ ]

What I want is:

<div>
You need to fill in the field 'name'
You need to fill in the field 'E-mail'
</div>

Name [ ]
Email [ ]

Any idea how to fix this without rewriting the whole module?