if(document.images) {
  
	var songson = new Image();  
	var songsoff = new Image();
	var wardon = new Image();
	var wardoff = new Image();
	
	songsoff.src = "images/sf_songs_off.gif"
	songson.src = "images/sf_songs_on.gif"
	wardoff.src = "images/sf_ward_off.gif"
	wardon.src = "images/sf_ward_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');
	}
}