function MakeVisibleA()
{
	
if (document.getElementById) {
	document.getElementById('myLayerA').style.visibility = 'visible';
	}
else if (document.all) {
	document.all.myLayerA.style.visibility = 'visible';
	}
else if (document.layers) {
	var l = 'myLayerA';
	eval('document.' + l + '.visibility="show"');
	}
} 

function MakeHiddenA()
{
if (document.getElementById) {
	document.getElementById('myLayerA').style.visibility = 'hidden';
	}
else if (document.all) {
	document.all.myLayerA.style.visibility = 'hidden';
	}
else if (document.layers) {
	var l = 'myLayerA';
	eval('document.' + l + '.visibility="hide"');
	}
} // function MakeHidden()

function MakeVisibleB()
{
	
if (document.getElementById) {
	document.getElementById('myLayerB').style.visibility = 'visible';
	}
else if (document.all) {
	document.all.myLayerB.style.visibility = 'visible';
	}
else if (document.layers) {
	var l = 'myLayerB';
	eval('document.' + l + '.visibility="show"');
	}
} // function MakeVisible()

function MakeHiddenB()
{
if (document.getElementById) {
	document.getElementById('myLayerB').style.visibility = 'hidden';
	}
else if (document.all) {
	document.all.myLayerB.style.visibility = 'hidden';
	}
else if (document.layers) {
	var l = 'myLayerB';
	eval('document.' + l + '.visibility="hide"');
	}
} // function MakeHidden()