var now_active=0;
var positions = [0,-141,-298,-434,-640,-860,-1006,-1137];

function show(num)
{
	if(now_active!=num)
	{
		hide(now_active);
		now_active=num;
		if(document.getElementById('sm'+num)) document.getElementById('sm'+num).style.display='';
		document.getElementById('ma'+num).style.backgroundPosition=positions[num-1]+'px 42px';
	}
}
function hide(num)
{
	if(now_active==0 || now_active!=num) return;
	now_active=0;
	if(document.getElementById('sm'+num)) document.getElementById('sm'+num).style.display='none';
	document.getElementById('ma'+num).style.backgroundPosition=positions[num-1]+'px 0px';
}