UI.Combo does not work on Firefox 3

i am using the UI.combo as a color selection drop down. co-worker installed firefox 3 and the combo does not work anymore. the scroll bar appears in the middle of the width, not on the right. also when click on an item, it does not select.

my code is:
<style>

.aw-image-Black {background-color: #000000;}
.aw-image-Blue {background-color: #6699FF;}
.aw-image-Green {background-color: #66CC00;}
.aw-image-Red {background-color: #FF3300;}
.aw-image-Yellow {background-color: #FFFF00;}
.aw-image-Purple {background-color: #CC33FF;}
.aw-image-Gray {background-color: #808080;}
.aw-image-Brown {background-color: #A5592A;}
.aw-image-White {background-color: #FFFFFF;}

#myColors .aw-item-image, #myColors-popup .aw-item-image {
border: 3px solid #fff;
}
</style>
<script>
var objAbove = new AW.UI.Combo;
objAbove.setId("myColors");
objAbove.setItemText(colorsText);
objAbove.setItemImage(colorsImage);
objAbove.setItemCount(colorsText.length);
objAbove.setControlText("Red");
objAbove.setControlImage("Red");

objAbove.getContent("box/text").setAttribute("readonly", true);
document.write(objAbove);

// update textbox image
objAbove.onSelectedItemsChanged = function(items){
this.setTimeout(function(){
this.setControlImage(this.getItemImage(items[0]));
});
}
</script>

any clues? is there any other known problems with Firefox 3? thanks

Which AW version do you use? FF 3 is only supported by AW 2.5.2.