function show(roll)
{
	var roll = roll;
	document.getElementById(roll).style.opacity='1';
	document.getElementById(roll).style.filter='alpha(opacity=100)';
}

function hide(roll)
{
	var roll = roll;
	document.getElementById(roll).style.opacity='0.5';
	document.getElementById(roll).style.filter='alpha(opacity=50)';
}