How do I force a repaint with jquery

How do I force a repaint with jquery

I have a video in an iframe that displays OK in IE, but its all dark in chrome.  I find that if I switch to another tab in chrome, and then switch back, it is now displayed.  So I'm thinking of forcing a repaint of the div that contains the iframe - or the iframe itself.  I experimented with .show, .hide, and .toggle, but  this doesn't seem to work.
Anyone  have ideas?