resolving conflicts between jquery script and plugin

resolving conflicts between jquery script and plugin

I notice that I am unable to use a form validation plugin when I have custom jquery script running on a reg. form that reveals drop down menus when a user selects a value from a parent drop down menu or selects 'yes' from radio button.  If I click the submit button with the jquery responsible for handling the revealing of these drop down menu, the form validation plugin is ignored.  If I comment out the jquery script, and press submit button, the form validation plugin works.  Any way to get both jquery script and plugin working at same time?  I used the jQuery.noConflict() and still cannot get both script and plugin working at same time.