if(document.images) {
  
	var kennedyon = new Image();  
	var kennedyoff = new Image();
	var forton = new Image();
	var fortoff = new Image();
	var songon = new Image();
	var songoff = new Image();
	var failureson = new Image();
	var failuresoff = new Image();
	
	kennedyoff.src = "images/sf_kennedy_off.gif"
	kennedyon.src = "images/sf_kennedy_on.gif"
	fortoff.src = "images/sf_fort_off.gif"
	forton.src = "images/sf_fort_on.gif"
	songoff.src = "images/sf_song_off.gif"
	songon.src = "images/sf_song_on.gif"
	failuresoff.src = "images/sf_failures_off.gif"
	failureson.src = "images/sf_failures_on.gif"
}


function off(imgName) {
	if(document.images) {
	document[imgName].src = eval(imgName + 'off.src');
	}
}

function on(imgName) {
	if(document.images) {
	document[imgName].src = eval(imgName + 'on.src');
	}
}