Greg,
First let's get you up to par on CSS, for this let's use something already here you can tinker with... this is a fine example:
https://vborg.vbsupport.ru/showthread.php?t=228319
Now as you can see there are three css "definitions" or "classes" if you will:
Code:
#headerFill{
background-image: url(images/headerFill.jpg);
background-repeat: repeat-x;
height: 119px;
width: 100%;
margin-right: auto;
margin-left: auto;
}
#headerL{
background-image: url(images/headerL.jpg);
height: 119px;
background-repeat: no-repeat;
width: 348px;
float: left;
}
#headerR {
background-image: url(images/headerR.jpg);
background-repeat: no-repeat;
height: 119px;
width: 332px;
float: right;
}
So do me a favor, and create a new style only admins can view, once that's done tinker with the Fluid Header mod by beermonster until you get it, once you have it you'll understand how to modify your forum to achieve what you want otherwise I'll walk you through it then. The point is yes I'm here to help however I want you to learn.
If you think about though, just in case your wondering... we're going to use a similar CSS to that of beermonsters plus add in one new class, that will house the wrapper which holds it all, the left column, center column, and right column when done and CSS stands for Cascading Style Sheet so it reads top to bottom by order of definitions.
There's many useful tricks of the trade per say once you can utilize CSS and it comes in handy trust me so post back when you have a mock up of the header, post your code here and we'll create the new definitions here and go from there, this way there's code you can easily relate to here for reference. *At least that way as I mentioned, you will have learned some CSS which is also our goal here.
Don't be afraid to shoot me a PM if you don't see me on and get froggy

.