Problem with white flash on loading content into iframe

[scribbler]

Help please,
I need to prevent a white flash which appears for a brief moment when my iframe loads some new content on to a web page with a black background. the brief white flash only seems to appear when browsing pages in IE8 or lower. If I understand correctly one possible way to go about solving this is to add an alpha/opacity filter code snippet of some sort to the iframe or page? specifically with IE8 in mind. Would appreciate it if someone could provide me a working example of a way to achieve this in XWD. (example of problem included in attachment)
thanks