if (document.images) {
	img1_on =new Image();  img1_on.src ="Resources/Images/concert-on.jpg"; 
	img1_off=new Image();  img1_off.src="Resources/Images/concert.jpg"; 
	 
	img2_on =new Image();  img2_on.src ="Resources/Images/donaties-on.jpg"; 
	img2_off=new Image();  img2_off.src="Resources/Images/donaties.jpg";
	 
	img3_on =new Image();  img3_on.src ="Resources/Images/contact-on.jpg"; 
	img3_off=new Image();  img3_off.src="Resources/Images/contact.jpg";
}
function imgOn(imgName) {
	if (document.images) 
		document[imgName].src = eval(imgName + "_on.src");
}

function imgOff(imgName) {
	if (document.images) 
		document[imgName].src = eval(imgName + "_off.src");
}