You can try this. For the div in your HTML, modify it like this:
<div id="something1" onclick="markMe('icon1', 'wnd1', event)">
<div id="something2" onclick="markMe('icon2', 'wnd2', event)">
<div id="something3" onclick="markMe('icon3', 'wnd3', event)">
And in your js use it like:
function markMe(icon, wnd, e) {
if (!e) var e = window.event;
e.stopPropagation();
$(".contentIconDesk").removeClass('markIconDesk');
if ($('#' + icon).hasClass('markIconDesk')) {
wndSelected = "";
} else {
$('#' + icon).addClass('markIconDesk');
wndSelected = wnd;
}
};