function activateTab(activeTab) {
    var tabIdBase = 'pageInteriorTabs';
    var tabIds = [ 'Students', 'Instructors', 'Desktop', 'Online', 'APR' ];
    
    for(var i = 0; i < tabIds.length; ++i) {
        var tabImg = document.getElementById(tabIdBase + tabIds[i]);
        if(tabImg) {
            if(tabIds[i].toUpperCase() == activeTab.toUpperCase()) tabImg.src = tabImg.src.replace('-inactive', '-active');
            else tabImg.src = tabImg.src.replace('-active', '-inactive');
        }
    }
}