problem with FF & dropdown width

Need help -- the dropdown filters at http://proximityone.com/k12schools/azschools3.htm work with IE but not FF. When running with FF the selection width is null; cannot see selection values. Code for combo1:

var combo1 = new AW.UI.Combo;
combo1.setStyle("width", "70px");
combo1.setControlText("LoGrade");
combo1.setItemText(names55);
combo1.setItemValue(names55AA); /// add Item Values
combo1.setItemCount(14);
combo1.onSelectedItemsChanged = function(index){
NestedFilter( combo1.getItemValue(index),9); //// Changed getItemText to get ItemValue
}

There is also a combo1-popup style width setting but has no affect in FF.
<style>
#combo1 {width: 70px; }
#combo1-popup {width: 60px;}
</style>

Thank you for any thoughts.