var myPos = 1;
function goToNext()
{
	nextPos = myPos+1;
	if (nextPos>12) nextPos=1;
	for (var i=1;i<=12;i++)
    {
		if (nextPos==i)
        {
			showBlockByID('holder'+i);
            myPos = i;
		} else
        {
			hideByID('holder'+i);
		}
	}
}
function goToPrev()
{
	prevPos = myPos-1;
	if (prevPos==0) prevPos=12;
	for (var i=1;i<=12;i++) {
		if (prevPos==i)
        {
			showBlockByID('holder'+i);
            myPos = i;
		} else
        {
			hideByID('holder'+i);
		}
	}
}