Hi, I have been asked to add a total value area on the Opportunities view.
I hope I explain this well, basically when you are on the listview of the opportunities there is a bar just below the search area that says actions (dropdown) and next to it tells you how many opportunities are selected. This is where I have been asked to add a total of the opportunities amounts so that they don't have to add it up themselves from the amounts showing the page.
This area also needs to update everytime a new amount for an opportunity is added so the total value will always go up.
Is there anyway at all in which I can do this. I am assuming I have to change the code behind but I do not want to mess it up. I think I can see where I need to make changes but am not sure how to make it work. Any ideas would be greatly received.

Cheers