var imgs = new Array(12); 
imgs[0] = "../images/link_img/home1.gif"; 
imgs[1] = "../images/link_img/home2.gif"; 
imgs[2] = "../images/link_img/serv1.gif"; 
imgs[3] = "../images/link_img/serv2.gif"; 
imgs[4] = "../images/link_img/rates1.gif"; 
imgs[5] = "../images/link_img/rates2.gif"; 
imgs[6] = "../images/link_img/edu1.gif"; 
imgs[7] = "../images/link_img/edu2.gif"; 
imgs[8] = "../images/link_img/contact1.gif"; 
imgs[9] = "../images/link_img/contact2.gif"; 
imgs[10] = "../images/link_img/locations1.gif"; 
imgs[11] = "../images/link_img/locations2.gif"; 
		
// preload the images 
function preLoadImages() { 
		var tmp = null; 
		for (var x = 0; x < imgs.length; x++) { 
			tmp = imgs[x]; 
			imgs[x] = new Image(); 
			imgs[x].src = tmp; 
		} 
}
// call the load function
preLoadImages();  
  
// swap images 
function imgSwap(img, swap) { 
	img.src = imgs[swap].src; 
}