if(document.images) {
	Btn = new Array(); 
	Btn[1] = new Image();
	Btn[1].src = "images/about.jpg"; 
	Btn[2] = new Image();
	Btn[2].src = "images/about_r.gif";
	Btn[3] = new Image();
	Btn[3].src = "images/service.jpg"; 
	Btn[4] = new Image();
	Btn[4].src = "images/service_r.gif";
	Btn[5] = new Image();
	Btn[5].src = "images/career.jpg"; 
	Btn[6] = new Image();
	Btn[6].src = "images/career_r.gif";
	Btn[7] = new Image();
	Btn[7].src = "images/BME_logo.jpg"; 
	Btn[8] = new Image();
	Btn[8].src = "images/BME_logo_r.jpg";
	Btn[9] = new Image();
	Btn[9].src = "images/BME_header.jpg"; 
	Btn[10] = new Image();
	Btn[10].src = "images/BME_header_r.jpg";
}

function changeIcon(from, to){
	if(document.images){
		document.images[from].src = Btn[to].src;
	}
}