How can I close space underneath a horizontal menu bar?

Hi folks, I would be very grateful if somebody might be able to help me with this problem. I am more of a digital designer (hobbyist) than "coder" and tend to just make my graphics fit the code that is already there. I am trying to learn html & css...but the progress has been frustratingly slow so far.

The problem I have is that I have "inherited" a blog template from a friend and I have adapted this to suit another blog. Everything looked fine until the menu bar buttons were added...and then a gap appeared between the menu bar and the main template.
http://i496.photobucket.com/albums/rr323/pimpmyblog/Misc/gap.png
I have tried everything that I can think of...and I'm sure the answer is really simple..to you :D. However it is driving me insane :o.

Please be kind to me...I'm still learning and this is really the first time I've tried to do something different. I would be so grateful if I could get rid of this gap. Thanks so much.

Add .widget-content{ /* to rectify the centering issue of the tabs when float applied */
width:962px;
margin:0 auto;
}
.widget-content a img{
float:left; /* the key idea is to change the images display property to block. */
} into your CSS :)

*does cartwheel*

Woo hoo! It worked, thank you so so much, I really appreciate it.

I have looked everywhere (including my books) for help with that. After 2 days of searching, I thought it might be time I asked an expert LOL.

Actually, I was typing you to ask for a link to your page and then made a search by typing the blog title in the given image.

FYI, that one is really a mysterious gap (https://developer.mozilla.org/en/images,_tables,_and_mysterious_gaps) !

Ok I think I *get* it now...though my head is about to explode with all the things I'm having to learn :o. I'm really enjoying the actual design side of things but really struggling with the code. It doesn't help that I have a short term memory problem...meaning everything takes like 10 times longer to sink in. Argh! Oh well, I guess I'll get there in the end. After years of just making designs to fit a specific template, I thought it was really time that I learnt how to write my own! I got a great book, which helps, but some of it still just goes right over my head.