function newImage(arg) 
{ 
   rslt = new Image(); 
   rslt.src = arg; 
   return rslt; 
} 

function preloadImages() 
{ 
   but1_over = newImage("menu1_big.gif"); but2_over = newImage("menu2_big.gif"); 
   but3_over = newImage("menu3_big.gif"); but4_over = newImage("menu4_big.gif"); 
   but5_over = newImage("menu5_big.gif"); 
}

function change(image,pic) {
	image.src='/img/'+pic;
}