How to show input (name + value) in textarea?

[Ownage73]

I'm working on this project where I need to have the value of a textarea change when one of the input values in the same form changes.HTML:\[code\]<form id="form" action="" method=""><textarea readonly class="overview"></textarea><input type="text" class="add" name="product1" /><input type="text" class="add" name="product2" /><input type="text" class="add" name="product3" /><input type="text" class="add" name="product4" /></form>\[/code\]The customer is allowed to change the input.class.The textarea-value should change whenever one of the inputs changes.The textarea should show something like:
3 x product1
1 x product3
4 x product4
Anybody got an idea?Thanks in advance,Joel