Concrete 5 CMS - Create drop-down nav menu and fix nav menu

Looking for someone who has experience with Concrete 5 CMS to fix 2 things on my website. Work to be done: 1. Create a drop-down menu - currently I have inserted a drop-down script in the [login to view URL] file and it was showing up for a few minutes then it wouldn't show up anymore. 2. Navigation menu links keeps moving upwards - currently my navigation menu keep moving upward when clicked, sometime it stays in the desired position but sometimes it keeps moving upwards. When refreshed, it will go back to the desired position. Please provide a quote. Any questions, please contact me.