使用Javascript检测用户何时在ASP.NET列表框中选择了一个项目

I am developing an ASP.NET web application that incorporates google maps. I have an ASP.NET listbox on my page which contains a list of items. When the user selects one of the items, I'd like to show this item on the map. The main complication lies in the fact that google maps uses javascript to control it and the listbox is a server control.I am developing an ASP.NET web application that