I have a page with some menus:
First:

And second:

In the first image you can see the page, but my problem is that when I open the menus (written with jQuery and CSS), all the page elements are going down. What is problem?
Edit:
i change it to position absolute instead of z-indcex but don’t have any affect.
You need to use position:absolute on the menus parent elements (usually ul), if you provide some code I can be more specific.