ASP.Net Listbox with multiple choice without using ctrl key

We have a few pages that use listboxes. They are declared as, for example:
<asp:ListBox ID="lst_Res" SelectionMode="Multiple" AutoPostBack="true" Style="font-family: Arial;
font-size: x-small" runat="server" Height="150px" CssClass="NoPrint" />

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This works fine as long as we hold down ctrl or use shift. Any computer tech will feel at home with this. But many users don't know that you need to hold ctrl. So I was wondering if it was possible to make a listbox where you don't have to hold ctrl. Clicking on any item will simply select/deselect it. Note that it still has to submit a postback after each change.
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CluskittAsked:
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Shaun KlineLead Software EngineerCommented:
The simplest solution is usually the best. Instead of overriding the standard way the list box works, why not add a label near the list box telling the user to hold down the ctrl button to select multiple items?

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CluskittAuthor Commented:
That was a thought that had already occurred. I was just wondering if we could make the .Net ListBox work like the VB6 used to work. There was no need for ctrl, and I thought it likely that someone would come up with a script that would emulate it. It would be preferable, because some users are reaaaaaaally computer incompetent. Even holding ctrl could possibly be too complicated for them, especially having to wait for postback after each click.
CluskittAuthor Commented:
Well, no other solution was presented, so it seems that I'll have to do just that.
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