Question

jQuery('div').not("#supcont").bind('click', function() {
    jQuery("#supcont").slideUp("slow");
});

On:

jQuery("#supcont").click();

Acts like #supcont is not exluded. Why?

Answer 1

It should work fine. The only reason I can think of that it may not, is that your #supcont element is a descendant of a div, and as the click event will bubble up, the div will receive it. To prevent that happening, you can use the stopPropagation method of the event object:

jQuery('div').not("#supcont").bind('click', function(e) {
    e.stopPropagation();
    jQuery("#supcont").slideUp("slow");
});

Update (see comments)

Actually, the above won’t help you if #supcont is a descendant of another div, you will need to capture the event on #supcont and stop it there. So bind a click event handler to #supcont too:

jQuery("#supcont").click(function(e) {
    e.stopPropagation();
});