Hi, it's just being hidden
On the sort by div, you set that to be float:left. HOwever, on an inner div you set a class .FloatRight so you now have a right float inside of a left float. IE7 doesn't like that.
You could either
1) Remove the .FloatRight class on that element (the one that also has hte .SortaBox class)
2) Manually override the float:right that is set