function Omn_Page_Unload()
{
    if(locationSearchBox.value != "Separate with comma (,)")
    {
        s.prop28 = locationSearchBox.value;
        s.t();
    }
   
}

if (window.attachEvent) {
	window.attachEvent("onunload", Omn_Page_Unload);	
} else {
	window.addEventListener("unload", Omn_Page_Unload, false);
}