function rollover(image, fname) {
	switch (image.className) {
		case 'off':
			image.className = 'on';
		break;
		case 'on':
			image.className = 'off';
		break;
	}
	image.src='images/'+fname;
}

function nav() {
		var tab = document.getElementById(page);
		tab.className = 'off';
}

function press(div) {
	if (div.className == 'studygroup') {
		div.className="studygroup_over";
	}else{ div.className = 'studygroup'; }
}

function visible(divid) {
	div = document.getElementById(divid);
	if(div.style.display == 'none'){
		div.style.display = 'block';
	} else {
		div.style.display = 'none';
	}
}