function change_image(id, src)
{
	 document.images[id].src=src;
}

function changeview(o,cl)
{	
	document.getElementById(o).className = cl;
}

function switchTo(from, to)
{
	document.getElementById(from).style.display = "none";
	document.getElementById(to).style.display = "block";
}



var curPicNum = '';

function checkPrevNext(curPic)
{
	if (curPic == 1)
		document.getElementById('prevPic').style.display = "none";
	else
		document.getElementById('prevPic').style.display = "block";

	if (curPic == maxPic)
		document.getElementById('nextPic').style.display = "none";
	else
		document.getElementById('nextPic').style.display = "block";
}

function showPic(category, picNum)
{
	curPicNum = picNum;
	document.getElementById('bigPic').style.display = "block";
	document.getElementById('bigPicImg').src = "images/" + category + "/" + picNum + ".jpg";
	checkPrevNext(parseInt(curPicNum, 10));
}

function internalChangePic(category, curPic)
{
	curPicNum = curPic.toFixed();
	switch (curPicNum.length)
	{
		case 1: curPicNum = "00" + curPicNum; break;
		case 2: curPicNum = "0" + curPicNum; break;
	}
	document.getElementById('bigPicImg').src = "images/" + category + "/" + curPicNum + ".jpg";
	checkPrevNext(curPic);
}

function prevPic(category)
{
	var curPic = parseInt(curPicNum, 10);
	if (curPic > 1)
	{
		curPic -= 1;
		internalChangePic(category, curPic);
	}
}

function nextPic(category)
{
	var curPic = parseInt(curPicNum, 10);
	if (curPic < maxPic)
	{
		curPic += 1;
		internalChangePic(category, curPic);
	}
}