Anyone knows how create a javascript "effect" for slide the website

My boss (my pointed hairy boss) want an effect in javascript for show an advertise. The effect he wants is some like this. When the user enter the site, a banner must appear and "push" the website out the screen, and that space must be use for the banner. After a few seconds, the banner must to disappear, and the website restore. I looked at various places for javascript libraries effects and i didn't found anything similar. Do you know some effects with similar characteristics?

I already look at jquery effects and other libraries, but the effects isn't exactly as the effects my boss want. I saw the effects one time, when he show me a similar banner in www.latercera.cl, but sadly the ad campaign isn't there anymore. I don't know how better explain this effects because my native 开发者_如何转开发language isn't English, is Spanish Thanks in advance

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Like how StackOverflow works when you get that yellow banner along the top?

This site uses jQuery. Check out the effects available there, for example slideDown

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Check out the jQuery library, and see if it has what you need. jQuery has a library of canned UI widgets, and it also has animation methods like sliding and transitioning that may enable you to build your own effect easily.