I manged to get the columns working by editing the ie6.css file:
I changed:
.contentBox {
padding: 12px;
}
to:
.contentBox {
padding: 12px;
float: left;
overflow:auto;
height:300px;
}
and:
.productResultsWrapper {height:1%;}
to:
.productResultsWrapper {height:1%;float:none; overflow:visible;}