Opacity effect with various effects 2 second delay:

Play with these settings by using the existing "popup apearence" styles any time and get cool effects as you experiment.

By changing the values of the code below you can apply an opacity fitler to a section of the hover ad or all of the hover ad:

Paste this code in the "Add own effect" field with various settings:

progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=100,finishOpacity=0.50,startX=0,finishX=100,startY=100,finishY=0)