Jquery Dropshadow on relative (height 80%) div element?

anybody knows if there is any form of autoReinitialise on jquery.dropshadow.js? I created a div with 80% height, and the shadow is nice. However whenever you resize the page and hence the div resizes too, the shadow keeps it's old height. The position cha开发者_JAVA技巧nges whatsoever.

Many thanks,

Mike