function activateClass(objDivID) {
	$('.tab').hide(); // selects everything with class of tab and hides it
	$('li.active').removeClass('active'); // selects every li with a class of active and removes the class
	switch(objDivID){
		case 'firstDiv':
			$('#tab1').addClass('active');
			$('#firstDiv').show();
			break;
		case 'secondDiv':
			$('#tab2').addClass('active');
			$('#secondDiv').show();
			break;
		case 'thirdDiv':
			$('#tab3').addClass('active');
			$('#thirdDiv').show();
			break;
		case 'fourthDiv':
			$('#tab4').addClass('active');
			$('#fourthDiv').show();
			break;
		case 'fifthDiv':
			$('#tab5').addClass('active');
			$('#fifthDiv').show();
			break;
		case 'sixthDiv':
			$('#tab6').addClass('active');
			$('#sixthDiv').show();
			break;
		case 'seventhDiv':
			$('#tab7').addClass('active');
			$('#seventhDiv').show();
			break;
		}
    }