function $(id) { return document.getElementById(id); }

var galImgs;
var galPos = 0;
var galImg;
function initGalerie(id, imgs)
{
	var btg = $(id+'_btg');
	var btd = $(id+'_btd');
	var trg = $(id+'_trg');
	galImg = trg;

	btg.onclick = function()
	{
		galPos = (galPos+galImgs.length-1) % galImgs.length;
		galImg.src = galImgs[galPos];
	};
	btd.onclick = function()
	{
		galPos = (galPos+1) % galImgs.length;
		galImg.src = galImgs[galPos];
	};
	
	if (imgs==null || imgs=='' || imgs.length==0)
	{
		btg.style.display='none';
		btd.style.display='none';
	}
	else
	{
		galImgs = Array(trg.src);
		for (var i=0; i<imgs.length; i++)
			galImgs[i+1] = imgs[i];
	}
}