function rOn(id){
	var div = document.getElementById(id);
	div.style.display = "block";		
}
function rOff(id){
	var div = document.getElementById(id);
	div.style.display = "none";
}
function showButton(id){
	switch (id){
		case 'rollOverb1': 
			document.getElementById('rollOverb1').className='button1On';
			document.getElementById('rollOverb2').className='button2Off';
			document.getElementById('rollOverb3').className='button3Off';
			document.getElementById('rollOverb4').className='button4Off';
			break;
		case 'rollOverb2': 
			document.getElementById('rollOverb2').className='button2On';
			document.getElementById('rollOverb1').className='button1Off';
			document.getElementById('rollOverb3').className='button3Off';
			document.getElementById('rollOverb4').className='button4Off';
			break;
		case 'rollOverb3': 
			document.getElementById('rollOverb3').className='button3On';
			document.getElementById('rollOverb1').className='button1Off';
			document.getElementById('rollOverb2').className='button2Off';
			document.getElementById('rollOverb4').className='button4Off';
			break;
		case 'rollOverb4': 
			document.getElementById('rollOverb4').className='button4On';
			document.getElementById('rollOverb2').className='button2Off';
			document.getElementById('rollOverb3').className='button3Off';
			document.getElementById('rollOverb1').className='button1Off';
			break;
	}
}