if(document.images) {
  
	var mydayon = new Image();  
	var mydayoff = new Image();
	var fashionon = new Image();
	var fashionoff = new Image();
	var fbion = new Image();
	var fbioff = new Image();
	var treeon = new Image();
	var treeoff = new Image();
	var tvon = new Image();
	var tvoff = new Image();
	
	mydayoff.src = "images/sf_day_off.gif"
	mydayon.src = "images/sf_day_on.gif"
	fashionoff.src = "images/sf_fashion_off.gif"
	fashionon.src = "images/sf_fashion_on.gif"
	fbioff.src = "images/sf_fbi_off.gif"
	fbion.src = "images/sf_fbi_on.gif"
	treeoff.src = "images/sf_tree_off.gif"
	treeon.src = "images/sf_tree_on.gif"
	tvoff.src = "images/sf_tv_off.gif"
	tvon.src = "images/sf_tv_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');
	}
}