if(document.images) {
  
	var assasinoff =  new Image();
	var assasinon =  new Image();
	var bookoff =  new Image();
	var bookon =  new Image();
	var opinionsoff =  new Image();
	var opinionson =  new Image();
	var polloff =  new Image();
	var pollon =  new Image();
	var quotesoff =  new Image();
	var quoteson =  new Image();
	
	assasinoff.src = "images/sf_assasin_off.gif";
	assasinon.src = "images/sf_assasin_on.gif";
	bookoff.src = "images/sf_book_off.gif";
	bookon.src = "images/sf_book_on.gif";
	opinionsoff.src = "images/sf_opinions_off.gif";
	opinionson.src = "images/sf_opinions_on.gif";
	polloff.src = "images/sf_poll_off.gif";
	pollon.src = "images/sf_poll_on.gif";
	quotesoff.src = "images/sf_quotes_off.gif";
	quoteson.src = "images/sf_quotes_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');
	}
}