if (document.images) {
  		
		
	var image1off = new Image();
	image1off.src = "images/button1off.gif";
	var image1on = new Image();
	image1on.src = "images/button1on.gif";

	var image2off = new Image();
	image2off.src = "images/button2off.gif";
	var image2on = new Image();
	image2on.src = "images/button2on.gif";
	
	var image3off = new Image();
	image3off.src = "images/button3off.gif";
	var image3on = new Image();
	image3on.src = "images/button3on.gif";

	var image4off = new Image();
	image4off.src = "images/button4off.gif";
	var image4on = new Image();
	image4on.src = "images/button4on.gif";

	var image5off = new Image();
	image5off.src = "images/button5off.gif";
	var image5on = new Image();
	image5on.src = "images/button5on.gif";

	var image6off = new Image();
	image6off.src = "images/button6off.gif";
	var image6on = new Image();
	image6on.src = "images/button6on.gif";
	
	var image2_1off = new Image();
	image2_1off.src = "images/button2_1off.gif";
	var image2_1on = new Image();
	image2_1on.src = "images/button2_1on.gif";
	
	var image2_2off = new Image();
	image2_2off.src = "images/button2_2off.gif";
	var image2_2on = new Image();
	image2_2on.src = "images/button2_2on.gif";
	
	var image2_3off = new Image();
	image2_3off.src = "images/button2_3off.gif";
	var image2_3on = new Image();
	image2_3on.src = "images/button2_3on.gif";

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

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