window.onload = showpulleys;

function showpulleys(pulleys) {
	if (document.getElementById == pulleys) {
		document.style.visibility = "hidden";
		document.style.position   = "absolute";
		
		}
	
	else {
		document.getElementById('pulleys').style.visibility = "visible";
		document.getElementById('pulleys').style.position   = "static";
		
		//These Layers are hidden
		document.getElementById('belts').style.visibility = "hidden";
		document.getElementById('belts').style.position   = "absolute";
		document.getElementById('plates').style.visibility = "hidden";
		document.getElementById('plates').style.position   = "absolute";
	}	
}

function belts(belts) {
	if (document.getElementById == belts) {
		document.style.visibility = "hidden";
		document.style.position   = "absolute";
		
		}
	
	else {
		document.getElementById('belts').style.visibility = "visible";
		document.getElementById('belts').style.position   = "static";
		
		//These Layers are hidden
		document.getElementById('pulleys').style.visibility = "hidden";
		document.getElementById('pulleys').style.position   = "absolute";
		document.getElementById('plates').style.visibility = "hidden";
		document.getElementById('plates').style.position   = "absolute";
	}	
}

function plates(plates) {
	if (document.getElementById == plates) {
		document.style.visibility = "hidden";
		document.style.position   = "absolute";
		
		}
	
	else {
		document.getElementById('plates').style.visibility = "visible";
		document.getElementById('plates').style.position   = "static";
		
		//These Layers are hidden
		document.getElementById('pulleys').style.visibility = "hidden";
		document.getElementById('pulleys').style.position   = "absolute";
		document.getElementById('belts').style.visibility = "hidden";
		document.getElementById('belts').style.position   = "absolute";
	}	
}