Step 1: Include this javascript on your page somewhere. This code assumes that your CFFORM is named "AddForm"
<script language="JavaScript"> function submitform() { ae_onSubmit(); if (_CF_checkAddForm(AddForm)) AddForm.submit(); } </script>
Step 2: Instead of a normal submit button, use:
<input type="button" name="Submit" value="Submit" onclick="submitform();">