Opening Graphic Animation

I need an opening graphic animation for a website that I am about to do. I don't know whether or not flash, html5, or javascript would be best (you tell me). I need to make an object in the middle of the screen, after clicking, to expand (more details later), and then at the end of the animation, a search bar will appear, and the slogan "Simplifying life's problems, one crack at a time." must be above the search bar. More details about the graphic that needs to be done later. You will need to be excellent at graphic design (not using a copyright picture , but rather your own expertise to draw it)