doing math operations during runtime

[manared]

I have to create an Expense Report using vb.net 2005 in a web app. I'm not sure how I want to start it out and lay out the program. Basically, I want something that looks like a table with dats on top and items along the left side and totals along the right side. In the middle the user has to fill out the dollar amounts he/she spent on particular items. Now this isn't really a problem, but what I want is to have the totals column automatically calculate the total while the user is typing in the fields. I'm not sure how to use asp tables, or if i should just use a bunch of textboxes. I can also utilize any RADs controls I want/need to. I can use the RAD numeric textbox, then the user can only type numbers, and other controls like that. I was just wondering what anyone thought about this and how you guys would do this project. I'm just not sure how to start. The one thing I do know, is that I'm going to have to use Javascript if I want the calculations done at runtime without refreshing the page. So I have to figure that out too using Master and content pages. (Right now I put the javascript in the master page and in the content page I add an attribute to a control)

So, any ideas on this? Any other questions, let me know!! Thanks much!!!