var ImageDir = "images/menu/";

if (document.images) {

btn1on = new Image();
btn1on.src = ImageDir + "bouton1-on.gif";
btn1off = new Image();
btn1off.src = ImageDir + "bouton1-off.gif";

btn2on = new Image();
btn2on.src = ImageDir + "bouton2-on.gif";
btn2off = new Image();
btn2off.src = ImageDir + "bouton2-off.gif";

btn3on = new Image();
btn3on.src = ImageDir + "bouton3-on.gif";
btn3off = new Image();
btn3off.src = ImageDir + "bouton3-off.gif";

btn4on = new Image();
btn4on.src = ImageDir + "bouton4-on.gif";
btn4off = new Image();
btn4off.src = ImageDir + "bouton4-off.gif";

btn5on = new Image();
btn5on.src = ImageDir + "bouton5-on.gif";
btn5off = new Image();
btn5off.src = ImageDir + "bouton5-off.gif";

btn6on = new Image();
btn6on.src = ImageDir + "bouton6-on.gif";
btn6off = new Image();
btn6off.src = ImageDir + "bouton6-off.gif";

btn7on = new Image();
btn7on.src = ImageDir + "bouton7-on.gif";
btn7off = new Image();
btn7off.src = ImageDir + "bouton7-off.gif";

btn8on = new Image();
btn8on.src = ImageDir + "bouton8-on.gif";
btn8off = new Image();
btn8off.src = ImageDir + "bouton8-off.gif";

btn9on = new Image();
btn9on.src = ImageDir + "bouton9-on.gif";
btn9off = new Image();
btn9off.src = ImageDir + "bouton9-off.gif";

btn10on = new Image();
btn10on.src = ImageDir + "bouton10-on.gif";
btn10off = new Image();
btn10off.src = ImageDir + "bouton10-off.gif";

btn11on = new Image();
btn11on.src = ImageDir + "bouton11-on.gif";
btn11off = new Image();
btn11off.src = ImageDir + "bouton11-off.gif";

btn12on = new Image();
btn12on.src = ImageDir + "bouton12-on.gif";
btn12off = new Image();
btn12off.src = ImageDir + "bouton12-off.gif";
}

function over2(imageName) { 
	
	document[imageName].src = eval(imageName + "on.src");
	
}

function out2(imageName) { 
	
	document[imageName].src = eval(imageName + "off.src");
	  
}