on = new Image();
off= new Image();

on.src="images/back2a.gif"
off.src="images/back1.gif"

var button

function rollOver(id) {
	
	if (document.images) {
		button=on.src
		document.getElementById(id).src=button;
	
	}
	
}


function rollOut(id) {
	
	if (document.images) {
		button=off.src
		document.getElementById(id).src=button;
	
	}
	
}