var pics;
var objcount = 0;
pics=new Array();

function preload(first,second){
pics[objcount]=new Array(2);
pics[objcount][0]=new Image();
pics[objcount][0].src=first;
pics[objcount][1]=new Image();
pics[objcount][1].src=second;
objcount++;
}

function on(number){
document.images[number].src=pics[0][1].src;
}

function off(number){
document.images[number].src=pics[0][0].src; 
}


preload("/spl/pic/bull.gif", "/spl/pic/rot_bull.gif");