function activateTab(tabID) {
		if (tabID == "top") {
			document.getElementById('menuSelect').style.display = 'none';	
			document.getElementById('menuTop').style.display = 'block';
			document.getElementById('menuTop').style.zindex = 55;
			document.getElementById('menuMiddle').style.display = 'none';			
			document.getElementById('menuBottom').style.display = 'none';
		}
		else if (tabID == "middle") {
			document.getElementById('menuSelect').style.display = 'none';	
			document.getElementById('menuTop').style.display = 'none';
			document.getElementById('menuMiddle').style.display = 'block';	
			document.getElementById('menuMiddle').style.zindex = 55;		
			document.getElementById('menuBottom').style.display = 'none';
		}
		else if (tabID == "bottom") {
			document.getElementById('menuSelect').style.display = 'none';	
			document.getElementById('menuTop').style.display = 'none';
			document.getElementById('menuMiddle').style.display = 'none';
			document.getElementById('menuBottom').style.display = 'block';
			document.getElementById('menuBottom').style.zindex= 55;
		}
		return;
}