I haven't got time to look at your code just yet, so here's some ideas off the top of my head:

For the sidebars, define a fixed width for each box (eg width: 200px; ).

For the font... Pop your stylesheet into a text editor with a search feature and search for comic. That will at least let you know where the problem is...

My recommendation:
[url=http://www.w3schools.com/css/default.asp]Learn CSS[/url].
Start over.
Post CSS and XHTML questions to the [url=http://forums.b2evolution.net/viewforum.php?f=2]client-side stuff forum[/url].

The CSS might be in an external file, but otoh, it looks like you've got plenty of inline CSS and non-semantic XHTML as well, so who knows what's causing what bits of style? This is exactly the sort of problem that is avoided by separating style and content.

i did initially use css, but it messed up the page completely, so i went back to using dreamweaver to create the basic layout, and put in the php where needed..

just the side bars that are causing the trouble.