prImg1=new Image(); prImg1.src="img/menu1b.gif";
prImg2=new Image(); prImg2.src="img/menu4b.gif";
prImg3=new Image(); prImg3.src="img/menu5b.gif";
prImg4=new Image(); prImg4.src="img/menu6b.gif";

prSubImg1=new Image(); prSubImg1.src="img/subMenu1b.gif";
prSubImg2=new Image(); prSubImg2.src="img/subMenu2b.gif";
prSubImg3=new Image(); prSubImg3.src="img/subMenu3b.gif";
prSubImg4=new Image(); prSubImg4.src="img/subMenu4b.gif";


function Roll(n,m){
 if(document.images){document.images[n].src="img/" + n + m + ".gif";}
}