function activateTabs(main) {
var mainTab = "#main_nav_" + main;
$(mainTab).addClass("active");
}

function activateTabs(main, secondary) {
var mainTab = "#main_nav_" + main;
$(mainTab).addClass("active");
if (secondaryTab != "") {
var secondaryTab = "#subnav_" + secondary;
$(secondaryTab).addClass("active");
}
}