Do you have time to explain it to me. I don't see where the width parameters are. I am not good with HTML or PHP, I just muddle through it. I'd like to take yours and make a 200-fluid-250 grid.
Don't worry. I'm a muddler too and discovered how to make the changes by fluke.
To change my grid to what you require just change the numbers within the brackets.
from:
(180px, 100%, 240px)
to:
(200px, 100%, 250px)
It really is that simple .
The only other edit that needs to be made would be if any of the three columns were being changed from a fixed to fluid or fluid to fixed width. It's not in your case so you don't have to be concerned about it.
Fixed width columns need to use:
<div class="yui-u first yui-sidebar">
Whereas fluid width columns need to use:
<div class="yui-u yui-panel">
Try this. I've only changed the size values within the brackets.