JQuery :: If Statement - When Click A Different Button To Open A Different Box - The "div#black" Should Stay Open And Not Toggle

Clicking on the menu buttons, a box with some info opens, ad under that, a div that makes the body of the site black. the problem is when i click a different button, to open a different box, the "div#black" should stay open and not toggle. i tried this

var black = $("div#black").toggle() ;
if (black == false { $("div#black).fadeIn("slow"); };

and this was the javascript for the button (with the toggle function, when i didn't use the if/else):

[Code]....

I don't know which is the correct way to write the if statement, i used easier ones but this one is to complex for me :D i think the main problem is the "var"