#2 Jun 13, 2008 18:29
First of all, jQuery is included in b2evolution, so use that rather than prototype. Otherwise there will be conflicts and errors at worst and wasted bandwidth at best.
When you're loading js libraries, use require_js: http://doc.b2evolution.net/v-2-4/evocore/_blogs---inc---_core---_template.funcs.php.html#functionrequire_js
That will only load the js if it hasn't already been loaded (provided the first plugin that tried to load it also used require_js).