var imgs = new Array(3); 
	imgs[0] = "./buttons/nav1_o.gif"; 
	imgs[1] = "./buttons/nav2_o.gif"; 
	imgs[2] = "./buttons/nav3_o.gif"; 
	imgs[3] = "./buttons/nav4_o.gif"; 
	imgs[4] = "./buttons/nav5_o.gif"; 
	imgs[5] = "./buttons/nav6_o.gif"; 
	imgs[6] = "./buttons/nav7_o.gif"; 

function preload() { 
	var tmp = null; 
for (var j = 0; j < imgs.length; j++) { 
	tmp = imgs[j]; 
	imgs[j] = new Image(); 
	imgs[j].src = tmp; 
} 
} 
void(preload()); 

function imgswap(img, swap) { 
	img.src = imgs[swap].src; 
}