if you place a div with margin-bottom:20px; IE would not show the margin at all if you do not flush the div to the bottom of the document(when content filled).

#content {background-color:#000;font-size:1px;margin-left:0;margin-right:0;margin-top:50px;margin-bottom:20px; }

This is the css style for the div.

To flush the div to the bottom of the document, use this style as well:

body {margin-bottom:0;}

Guess what just this won’t work either.

.clear1 { height:1px;font-size:1px;padding:0;clear:left; }

Use <div class=”clear1″>&nbsp;</div> at the very end of the page.
That should do.