Adobe Flash embeds do not follow standard z-index visibility rules. You will need to set the wmode parameter to transparent to make CometChat appear in front of Flash objects/advertisements.
For example, look at the wmode parameters in this sample YouTube code:
<object width='425' height='344'>
<param name='movie' value='http://www.youtube.com/v/Ahg6qcgoay4'>
<param name='type' value='application/x-shockwave-flash'>
<param name='allowfullscreen' value='true'>
<param name='allowscriptaccess' value='always'>
<param name="wmode" value="transparent" />
<embed width='425' height='344'
src='http://www.youtube.com/v/Ahg6qcgoay4'
type='application/x-shockwave-flash'
allowfullscreen='true'
allowscriptaccess='always'
wmode="transparent"
></embed>
</object>
For more information, refer to the Adobe article on Transparent background in a SWF file.
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