Which php file in the payment directory takes care of payment processing? The "please wait" message is towards the end, something like :
<table width=100% height=100%>
<tr><td align=center valign=middle>Please wait while connecting to <b>SECPay</b> payment gateway...</td></tr>
</table>
You can safely remove the message. (Backup first!!) If you don't find it there let me know, I'm sure I can help you find it.