I'm having some problems when I have a dynamic content that uses JQuery. It want display in preview mode, since /sysadmin/Shell/ClientResources/EPiJQuery.js is added first to the preview page. 

Do anyone know how to "remove" the epi jquery function so jquery will start to work?

Are adding in code behind EPiServer.ClientScript.ClientScriptUtility.RegisterClientScriptFile(page,"jquery.js") and other js files, but they get added after episerver jquery lib