If you click the orange ORDER button at the top the #dimmer should cover the whole background and the form should appear at the top. (lightbox-like effect)
The problem is that in IE7 the #dimmer would appear at the top regardless of it's z-index.
In other browsers everything works nicely.
Link: http://fenelon.ru/projects/SpaceFood/2.1-jQuery/
Thank you, fellows!