Drop Down Menus Not Working on iPad or iPhone

The sub menus work great on a web browser but when using an iPad or iPhone the menus with no sub menus work fine but the ones with sub menus don't work and only sometimes for a split second show then disapear. I tried deactivating all the plug ins and tried deleting all of my custom css to see if I created an error there but so far nothing fixes it. Any ideas? www.boiserockschool.com Thanks Kelly