Remeber the state of the dropdownbox after a call from the action class

Remeber the state of the dropdownbox after a call from the action class

Hai I have a Dropdown box that populated dynamically from DB When user
submits the data he selected the control goes to action and comes back ..
I want to keep the dropdown box state as user selected previously .. I am
very new to JQuery please be expressive thanks in advance.
I am using Struts2 select tag for dropdown