n1 = new Image(); 
n1.src = "images/n_home.gif";
r1 = new Image(); 
r1.src = "images/r_home.gif";

n2 = new Image(); 
n2.src = "images/n_ccf.gif";
r2 = new Image(); 
r2.src = "images/r_ccf.gif";

n3 = new Image(); 
n3.src = "images/n_solutions.gif";
r3 = new Image(); 
r3.src = "images/r_solutions.gif";

n4 = new Image(); 
n4.src = "images/n_about.gif";
r4 = new Image(); 
r4.src = "images/r_about.gif";

n5 = new Image(); 
n5.src = "images/n_contact.gif";
r5 = new Image(); 
r5.src = "images/r_contact.gif";

function changeImage(imgName, imgSrc){
 document.images[imgName].src = imgSrc.src;
}