//picture ID = bigpic
var initLaunched;



function init(){
	if(initLaunched){
		prevewEvents();
	}
	initLaunched=true;
}

function prevewEvents(){
	if(document.getElementById('bigpic') && document.getElementById('thumbnails')){
		var imgLinks=document.getElementById('thumbnails').getElementsByTagName('IMG');
		for (var imgIdx = 0; imgIdx < imgLinks.length; imgIdx++){
			imgLinks[imgIdx].onclick=function(){
				if(this.parentNode.tagName=='A' && this.parentNode.href !='')
					document.getElementById('bigpic').src=this.parentNode.href;
			}
		}
		var thArr=document.getElementById('thumbnails').getElementsByTagName('A');
		for (aIdx = 0; aIdx < thArr.length; aIdx++){
			addEvent(thArr[aIdx], 'click', cancel);
		}		
	}
}


function addEvent(obj, evType, fn){
	if (obj.addEventListener) {
	    obj.addEventListener(evType, fn, false);
    	return true;
	}else if (obj.attachEvent) {
		var r = obj.attachEvent("on"+evType, fn);
	    return r;
    }else{
    return false;
  }
}

function cancel(e) {
  if (e && e.preventDefault)
    e.preventDefault(); // DOM style
  return false; // IE style
}

window.onload=init;