// array of images 
var imgsOFF = new Array(6); 
imgsOFF[0] = "./images/btn_off_qui.jpg"; 
imgsOFF[1] = "./images/btn_off_realisation.jpg"; 
imgsOFF[2] = "./images/btn_off_contact.jpg"; 
imgsOFF[3] = "./images/btn_off_numerique.jpg";  
imgsOFF[4] = "./images/btn_off_vinyle.jpg"; 
imgsOFF[5] = "./images/btn_off_serigraphie.jpg";
imgsOFF[6] = "./images/btn_off_services.jpg"; 

var imgsON = new Array(6); 
imgsON[0] = "./images/btn_on_qui.jpg"; 
imgsON[1] = "./images/btn_on_realisation.jpg"; 
imgsON[2] = "./images/btn_on_contact.jpg"; 
imgsON[3] = "./images/btn_on_numerique.jpg"; 
imgsON[4] = "./images/btn_on_vinyle.jpg"; 
imgsON[5] = "./images/btn_on_serigraphie.jpg"; 
imgsON[6] = "./images/btn_on_services.jpg"; 

// preload the images 
function preloadOFF() { 
	var tmp = null; 
	for (var j = 0; j < imgsOFF.length; j++) { 
		tmp = imgsOFF[j]; 
		imgsOFF[j] = new Image(); 
		imgsOFF[j].src = tmp;
	} 
} 
// preload the images 
function preloadON() {
	var tmp = null; 
	for (var j = 0; j < imgsON.length; j++) { 
		tmp = imgsON[j]; 
		imgsON[j] = new Image(); 
		imgsON[j].src = tmp;
	} 
} 
function preloadImgs(){
	preloadOFF();
	preloadON();
} 

// swap images 
function imgONSwap(img, swap) { 
	img.src = imgsON[swap].src; 
} 
// swap images 
function imgOFFSwap(img, swap) { 
	img.src = imgsOFF[swap].src; 
}