var current_side = "";
function side_swapper(side) {
if (current_side==""){
	document.getElementById(side).style.visibility = "visible";
	current_side = side;
	}
	
else {
	document.getElementById(current_side).style.visibility = "hidden";
	document.getElementById(side).style.visibility = "visible";
	current_side = side;
	}
}