Adding multiple .NET User Controls that use JavaScript to the same page

The Background
Recently I was faced with the task of taking some existing VB.NET code and converting it to C#. Not so difficult so far you’ll say, and you’d be right. However, some of the code on this particular page was contained within a User Control which contained two lists of check boxes in two different categories, which for each category, when a check box item was clicked, was transferred via JavaScript to another (text) list for that category and the selected checkbox removed from the appropriate checkbox list.

