var swapIndex=0;
function getSwaps() {
	var pc=document.getElementById('caption');
	var sw=pc.getElementsByTagName('div');
	var ret=[];
	for (var i=0; i<sw.length; i++) 
		if (/(^| )swap( |$)/i.test(sw[i].className)) 
			ret.push(sw[i]);
	return sw;
}
function artLoad() {
	var n=document.getElementById('picNext');
	var pg=document.getElementById('picGroup');
	attach(n,'click',nextClick);
	n.style.display='block';
	if (window.event) attach(n,'dblclick',nextClick);
	pg.scrollTop=0;
	var sw=getSwaps();
	sw[0].style.display='block';
	for (var i=1; i<sw.length; i++) sw[i].style.display='none';
}
function nextClick() {
	var pg=document.getElementById('picGroup');
	var sw=getSwaps();
	swapIndex+=1; if (swapIndex==sw.length) swapIndex=0;
	pg.scrollTop=swapIndex*(window.event?438:439.1);
	var idx=pg.scrollTop/440;
	for (var i=0; i<sw.length; i++) 
		if (i!=swapIndex) sw[i].style.display='none';
		else sw[i].style.display='block';
}
attach(window,'load',artLoad);