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To make thepeer's answer work in IE 7 and forward, it needs a few tweaks.
IE will not honour z-index if the element is has no background-color, so the link will not overlap parts of the containig div that has content, only the blank parts. To fix this a background is added with opacity 0.
For some reason IE7 and various compatibility modes completely fail when using the span in a link approach. However if the link itself is given the style it works just fine.
.blockLink
{
position:absolute;
top:0;
left: 0;
width:100%;
height:100%;
z-index: 1;
background-color:#ffffff;
-ms-filter:"progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";
filter: alpha(opacity=0);
opacity:0;
}