[jQuery] CSS class/id naming problem

[jQuery] CSS class/id naming problem

Hi All,
When using JQuery, it seems to dislike underscores in class/id names. For example:
$("div.class_name").size()
That doesn't return anything. However, if I change it to:
$("
div.className").size()
It works perfectly (assuming I've changed the actually class name on the div as well).
Is this a CSS standards thing? Is underscore not allowed or is it a JQuery bug?
Cheers,
Brendyn
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