[jQuery] Noob syntax question re toggle between css attributes

Dear all,

I've been faffing with this thing all morning. The more I faff, the
closer I get to using getElementById. The following should toggle the
background colour of a submit button's parent (a containing 'span' tag
pair set to display:block)

I am obviously missing something very simple.

$(".doSetSelect").click(function(event) {

if ($(this).parents(".def_set").css("backgroundColor") ==
"rgb(238,238,238)")
        { $(this).parents(".def_set").css({backgroundColor:
"rgb(255,255,255)"}) }
else
        { $(this).parents(".def_set").css({backgroundColor:
"rgb(238,238,238)"}) }

        return false;
        });

In expectation of kicking myself ;-)

All the best,
Dug