I'm blank now ! need help

hi there,

i’m stuck because of my button problems. i’m not sure whats wrong there. The Nav button … it works fine but not when i click the ‘showcase’ menu … then it’ll goes into the showcase bit … but later after that, the nav isn’t functional properly anymore … if anybody could help this will be superb !!

kinda big file … around 4 mb i can send it to you using u send it if anyone can help!!

pls pls…