To get rid of this problem you just need to set the parameter “wmode” (Window Mode) to transparent in object properties.
e.g.
<object classid="clsid:166B1BCA-3F9C-11CF-8075-444553540000"
codebase="http://download.macromedia.com/pub/shockwave/cabs/
director/sw.cab#version=10,1,1,0"
width="?" height="?">
<param name="src" value="?.swf" />
<param name="wmode" value="transparent" />
<embed src="?.swf" width="?" height="?"
pluginspage="http://www.adobe.com/shockwave/download/"
wmode="transparent"></embed>
</object>
Thats it