fitting checkboxes and radios in a fixed-width Div

I want to make a orange box which contains radios, checkboxes, and dropdowns (select elements).
I want to give the orange box a fixed width, so that if there are too many elements in a line, they move to the next line in the div.
I gave my div a "max-width", and specified widths for most elements within it.
It works OK with radios, and checkhoxes, but "select" elements (dropdown lists), seem to break it in both chrome and IE.
I put the example at:
http://rateforsuccess.com/askcss.htm

Thanks.