var rev=1;

var n_revs=2;

function chg_rev(side)
{
	if (side==1)
		rev=rev+1;
	else
		rev=rev-1;
	
	ck();
	document.getElementById('rev').src="http://www.mundodacrianca.co.pt/images/stories/mundodacrianca/capas/mc"+leading(rev)+".jpg";
	document.getElementById('rev_lnk').href="http://www.mundodacrianca.co.pt/images/stories/mundodacrianca/pdf/MC"+leading(rev)+".pdf";
}

function leading(n)
{
	if(n<10)
		return '0'+n;
	return n+"";
}

function ck()
{
	if (rev<=1)
	{
		document.getElementById('drt').innerHTML="<div style=\"cursor:pointer\" onmousedown=\"chg_rev(1)\"><img src=\"http://www.mundodacrianca.co.pt/images/stories/mundodacrianca/capas/direita.jpg\" /></div>";
		document.getElementById('sqrd').innerHTML="";
		rev=1;
	}
	else
	{
		if (rev>=n_revs)
		{
			document.getElementById('sqrd').innerHTML="<div style=\"cursor:pointer\" onmousedown=\"chg_rev(0)\"><img src=\"http://www.mundodacrianca.co.pt/images/stories/mundodacrianca/capas/esquerda.jpg\" /></div>";
			document.getElementById('drt').innerHTML="";
			rev=n_revs;
		}
		else
		{
			document.getElementById('drt').innerHTML="<div style=\"cursor:pointer\" onmousedown=\"chg_rev(1)\"><img src=\"http://www.mundodacrianca.co.pt/images/stories/mundodacrianca/capas/direita.jpg\" /></div>";
			document.getElementById('sqrd').innerHTML="<div style=\"cursor:pointer\" onmousedown=\"chg_rev(0)\"><img src=\"http://www.mundodacrianca.co.pt/images/stories/mundodacrianca/capas/esquerda.jpg\" /></div>";
		}
	}
}

function start()
{
	if(n_revs>1)
	{
		document.getElementById('drt').innerHTML="<div style=\"cursor:pointer\" onmousedown=\"chg_rev(1)\"><img src=\"http://www.mundodacrianca.co.pt/images/stories/mundodacrianca/capas/direita.jpg\" /></div>";
	}
}