Hello soulfullofmusic
Have you tried to create 2 skins and within your skin.css file create a style within your menu for your separate buttons:
.bluebutton {background: #0d1d43 url(buttonBlueBG.gif)}
.redbutton {background: #ff0000 url(buttonRedBG.gif)}
Have a page for client 1 using skin bluebutton (3 blue buttons) and within your skin set the css menu class to use the menu with the blue button class
<div id ="MLMENU" class="bluebutton">
Have a page for client 2 using skin redbutton (3 red buttons) and set your menu to use the red button class.
<div id ="MLMENU" class="redbutton">
I am not familiar with [MLMENU] I hope this helps
Regards
Lynn