Jquery not working properly

Hi, I have an issue with jquery library. I have version 1.7 and I created a plugin with jquery support. The library is referenced in overridden metatags. The problem is taht although the jquery support works fine for my plugin, it doesnt work for the rest of the site, namely widgets are not loading, I cannot dismiss green message boards, etc. When I deactivate the plugin the site works fine. I think that jquery library are referenced 2 times, 1 for index and another time for my plugin. I do not know how to change that. Is is possible to override metatags just for my plugin not for the entire site? Any suggestions?