\"#business\" is currently set to background: #323232; How can I change it to #000; after I click on \"#business\" and back to 323232 once the menu is closed?
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If you want to change the background of an element (in your case "#business") to a color, you simply do:
$("#business").css({ "background": "#000" });
But I am not sure what you mean by the "menu", you should probably show us the code of your HTML!