Adding a horizontal DHTML-menu on site, and when opening in firefox the items are spread on the entire with, of the site.
Any good ideas of how to fix this problem?

Tango

Far as I can tell, there is a conflict with the
table {width: 100%}
tag inside the style.css file

My theme needs that width stipulation in order to show up correctly. But I did find out that when I removed that
table {width: 100%}
tag, the menu showed up correctly.

But, as I said, the theme I'm using needs that tag in order to show up correctly. But for those who can get away with deleting that 100% width, your DHTML menu should work hopefully.

Ok. If you're using the Sothink DHTML menu, I think I may have found a possible solution:

In Sothink DHTML menu code, one of the css variables is
.st_tbcss

So, what I did was add the following code to my XOOPS theme's style.css file:

.st_tbcss{border:none;padding:0px;margin:0px; width: 140px;}

Now, I set my width to 140px just testing to see if it worked. And it did. I think it just needed a width value just to keep it from displaying at 100%. So, I guess you can test it with another width value, but for now, I'm leaving mine at 140px.