function roll_over(img,format) {
	var obj = document.getElementById(img);
	
	obj.src = 'images/' + img + '_on.' + format;
}

function roll_out(img,format) {
	var obj = document.getElementById(img);
	
	obj.src = 'images/' + img + '_off.' + format;
}

function showInfo(div){
	var obj = document.getElementById(div);
	
	obj.style.display = 'block';
}

function hideInfo(div){
	var obj = document.getElementById(div);
	
	obj.style.display = 'none';
}