var maxz=1;
function rotate(n){
	var cf;
	for(var i=1;i<=n;i++)
	{
		cf='feat'+i;
		if(i==maxz) $(cf).setStyle('z-index',1);
		else $(cf).setStyle('z-index',0);
	}
	maxz++;
	if(maxz>n) maxz=1;
}