// array of images 

var imgs = []; 
    imgs[0] = "imagenes/menu/home.jpg"; 
    imgs[1] = "imagenes/menu/home_hover.jpg"; 
	
    imgs[2] = "imagenes/menu/somos.jpg"; 
    imgs[3] = "imagenes/menu/somos_hover.jpg"; 
	
    imgs[4] = "imagenes/menu/acerca.jpg"; 
    imgs[5] = "imagenes/menu/acerca_hover.jpg"; 
  
    imgs[6] = "imagenes/menu/pasos.jpg"; 
    imgs[7] = "imagenes/menu/pasos_hover.jpg"; 
  
    imgs[8] = "imagenes/menu/exterior.jpg"; 
    imgs[9] = "imagenes/menu/exterior_hover.jpg"; 
  
    imgs[10] = "imagenes/menu/contacto.jpg"; 
    imgs[11] = "imagenes/menu/contacto_hover.jpg"; 
  
  
  
// 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; 
}