Many developer make this mistake. While we mouse over the menu, the flash movie or flash animation above the html menu and we are not able to click it.
Why the flash blocked my menu ?
Why the swf above the html ?
Why the advertisement flash above all the things ?
So, how to make the flash object run behind the html layer ?
It is very simple, just add this code in your flash parameter.
< param name="wmode" value="opaque">
For more information about the flash parameter, you can read the official manual from Adobe in here