使用JQuery更新span标记值

I'm trying to update a span tag that is in a fieldset tag that is in a legend tag. The idea is to update the cost of a Software Item as components are selected. The code below works fine if I only have one software item (e.g. - Visual Studio 2008 Pro 00), but if I add a second item in another fieldset, then when I try to update the span for that fieldset, it updates the span for the fieldset containing my Visual Studio Software. Any ideas what I'm doing wrong?I'm trying to update a span tag that is in a fi