Plugins and javascript conflicts

hi, I have tried about 6 different lightbox plugins but they all tend to break the other javascripts that I am running on the site. Are there steps I can take to prevent there from being a conflict. This is the plugin that came the closest:
http://stimuli.ca/lightbox/

but it still messed up my superfish menus which are powered by the jquery library. Does this have anything to do with the way I am calling in the scripts? I have the menu scripts hardcoded into the template files and the lightbox scripts as part of the plugin.

THanks for pointing me somewhere I can make more sense of this.