Need to control Z-index of rotator...

I'm having trouble with the menus falling behind the rotator at this URL:
www.okwondertorium.org

I searched the forum and found what I thought was a possible answer and changed the z-index of .nivoSlider a.nivo-imageLink (modules/mod_hot_effects_rotator/tmpl) to z-index:20000

However, I still have the same problem when I go back and forth from the linked pages back to the HOME rotator page.

I also noticed that – with this setting – the manual arrows are now "behind" the image link so they don't work.

Need some help here... and I also need the path for any code changes. For instance, I couldn't locate template_css.css as you have noted in several answers.

In advance, thank you for your help!
LH

Your menu z-index is 11, and rotator 99 , so better put menu in front of rotator

layout.css:

#menu {
position: absolute;
top: 150px;
left: 10px;
z-index: 11;
}

put z-index: 200;