what is the forum id variable?

[zemic]

Hi,

Im looking for help with a simple image selector script where it selects an image depending on the forum your in.

My problem is , I dont know what the forum id variable is, so this code does not work:

//if forum id = 88
if($f == "88") {
    //display this image
    $var = "<img src="someimage.jpg">";
} else {
    //do nothing
}

any ideas?