I'm trying to build a websites with jquery libraries and there is a conflict in my website. I want to get the parallax effect that you can see here: http://www.danygiguere.ca/mydanya/index.html#1. However once I add the stylesheet: <link rel="stylesheet" type="text/css" href="css/menu_sideslide.css" />, my website becomes like this:  http://www.danygiguere.ca/mydany/index.html#1. The problem is that I don't see the parallax images anymore. I know it's a CSS issue but just can't find it. Anybody tell me what it is ?