IE 6 and absolute positioning

[venerable bede]

I have a panel on my webpage with the following css :

.pnlParameterCollectionStyle
{		
	position:absolute;
	width:64%;
	height:60%;
	top:20px;
	left:20%;
	z-index:102;
	border:solid 3px gray;
	background-color:White;	
	min-height:500px;
	min-width:600px;

}

The problem I am having is that when the web page renders the panel does not appear. However when I resize the browser using the handle in the bottom right hand corner it magically appears.

Does anyone have any idea what is going on ?
I HATE IE 6 !!