[jQuery] Selector Containing Variable

[studiobl]

I'm having trouble with a jQuery selector that contains a variable.
I'm trying to target an element that has a class of "orderInfo" and an
id of "billy"

So, I set a variable:

var tabText = "billy";

...and it works if I use the string:

$(".orderInfo[id='billy'"];

...but not the variable:

$(".orderInfo[id=tabTest"];


...but of course I need it to work with a variable {insert appropriate
emoticon here}