var lastSrc = '';
var nextSrc = '';

function nextPic(){
	// if lastSrc is set, display it, otherwise display default
	document.getElementById('img').src = nextSrc;
}

function lastPic(){
	// if lastSrc is set, display it, otherwise display default
	document.getElementById('img').src = lastSrc;
}

function changePic(source){

    lastSrc = document.getElementById('img').src;
    document.getElementById('img').src = source;
}




/****************************************************
*	        DOM Image rollover:
*		by Chris Poole
*		http://chrispoole.com
*               Script featured on http://www.dynamicdrive.com
*		Keep this notice intact to use it :-)
****************************************************/

function init() {
  if (!document.getElementById) return
  var imgOriginSrc;
  var imgTemp = new Array();
  var imgarr = document.getElementsByTagName('img');
  for (var i = 0; i < imgarr.length; i++) {
    if (imgarr[i].getAttribute('hsrc')) {
        imgTemp[i] = new Image();
        imgTemp[i].src = imgarr[i].getAttribute('hsrc');
        imgarr[i].onmouseover = function() {
            imgOriginSrc = this.getAttribute('src');
            this.setAttribute('src',this.getAttribute('hsrc'))
        }
        imgarr[i].onmouseout = function() {
            this.setAttribute('src',imgOriginSrc)
        }
    }
  }
}
onload=init;