I'd like to be able to select a specific group of elements.  Is there any performance or other issue with specifying a class name for each element if there is no CSS defined for the class?  For example, if I have the following:

<div id="part1" class="myGroup">other stuff</div>

<div id="part2" class="myGroup">other stuff</div>

$(".myGroup").something...

If I have no CSS class called .myGroup, would there be any problem with that?

Tony