dhtml listbox question

lets say i have a listbox on a web page, HTML that is. it would be as follows:
mikejoedon

now the point is when i click on and select the option don. i want to change its status in the list to 2nd. thus making the order mike,don,joe.

then if i run the logic again when don is selected i would like to have the list be don,mike,joe.

i would like to use the methods and properties of the listbox to do this. if it is possible.