normbut = new newarray(6);
highbut = new newarray(6);

for (i=0;i<6;i++) {
    normbut[i].src = "mmnu" + parseInt(i+1) + "_i.jpg";
    highbut[i].src = "mmnu" + parseInt(i+1) + "_a.jpg";
}

function newarray(n) {
    this.length = n
    for (var i = 0; i<=n; i++) {this[i] = new Image()}
    return this
}

function highlight(num) {
       document.images[num+1].src = highbut[num].src;
}

function normal(num) {
       document.images[num+1].src = normbut[num].src;
}
  
var index = 1;
var chImg;
var stopped = false;
function ci() {
  document.dynimg.src="img/p"+(index++)+".jpg";
  if (index == 5) index=1; 
  chImg = setTimeout("ci()", 2000);
}
function stop() {
  clearTimeout(chImg);
}

function ss() {
  if (stopped) {
    stopped=false;
    ci();
  }
  else {
    stopped=true;
    stop();
  }
}