How can I select an element with multiple classes?

I want to select all the elements that have the two classes a and b.
<element class="a b">
So, only the elements that have both classes.
When I use $(".a, .b") it gives me the union, but I want the intersection.

Answer:

If you want an intersection, just write the selectors together without spaces in between.
$('.a.b')
So for an element that has an ID of a with classes b and c, you would write:
$('#a.b.c')


http://stackoverflow.com/questions/1041344/how-can-i-select-an-element-with-multiple-classes