how to show multiple saved values as selected in h:selectManyListBox

Hi,
I want to show multiple values in list box& I should be able to select & save & retrieve saved values. e.g. In a employee table I have column for skills in which I want to store selected skills as comma seperated string.

The list for skills which I am showing using h:selectManyListBox tag. When I am selecting more than 1 values here those I am saving in database as comma seperated string. e.g html,jsp,vb,java etc. But when i am opening the details for this employee for whom I have saved multiple skills; I am not getting how to show already saved skills as selected in this select many box.

can anybody help please..

Thanks in advance,

The valuebinding of the selectManyListBox should be mapped to a List.