var imgs = new Array(31);
imgs[0] = "./images/button_1.gif";     
imgs[1] = "./images/button_1_R.gif";     
imgs[2] = "./images/button_2.gif";     
imgs[3] = "./images/button_2_R.gif";     
imgs[4] = "./images/button_3.gif";     
imgs[5] = "./images/button_3_R.gif";     
imgs[6] = "./images/button_4.gif";     
imgs[7] = "./images/button_4_R.gif";     
imgs[8] = "./images/button_5.gif";     
imgs[9] = "./images/button_5_R.gif";
imgs[10] = "./images/sent.gif";     
imgs[11] = "./images/sent_R.gif";
imgs[12] = "./images/home.gif";     
imgs[13] = "./images/home_R.gif";

// preload the images   
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());    
	
// swap images   

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