Menu and plugins

Menu and plugins

Hello,

I've Wordpress 3.1 installed on my site ( www.caae.cl/wordpress )
First, I used a menu which I found here : http://www.webdesigndev.com/web-development/create-the-fanciest-dropdown-menu-you-ever-saw

I installed the menu on a HTML page where I designed everything. It worked perfect.
Then I used the HTML and CSS that I've created and used it on my WP theme. It still worked perfect, I was using jQuery 1.5, even thought the menu is supposed to work on older versions (it was made in 1.3.2)

The problem comes when I install another plugins which also use jQuery. The menu won't work, but the plugins work perfect (like the calendar and flickr photos lightbox). I thought it was a double call of jQuery, so I deleted the line that called 1.5, but still doesn't work. The version that comes with WP, which is the one the plugins use, is 1.4.4 (newer than the one the script was created on), so it should work.

I tried changing the version of jQuery in my HTML to test if it was some problem with the plugins or just the jQuery, and there it was. With 1.4.4 on the HTML it didn't work.

So the question is, why it doesn't work on jQuery 1.4.4 if it worked on 1.3.2?

I have all the code of menu, some plugins (hoverIntent and easing) and another code for multiple things on a file caaejs.js which is called on the header.

Any help would be appreciated for getting the menu working, thanks a lot!