// hide Layers
        function showLayer(l,height) {
	        layerId = document.getElementById(l).id;
        	
	        if (layerId == 'menu-aboutus') {
		        document.getElementById('menu-aboutus').style.left =630+ 'px';
		        document.getElementById('menu-aboutus').style.top = height + 'px';
        		
	        }
	        else if (layerId == 'menu-glossary') {
		        document.getElementById('menu-glossary').style.left =742 + 'px';
		        document.getElementById('menu-glossary').style.top = height + 'px';
	        }
	        else if (layerId == 'menu-arabian') {
		        document.getElementById('menu-arabian').style.left =445 + 'px';
		        document.getElementById('menu-arabian').style.top = height + 'px';
	        }
        	
	        document.getElementById(l).style.display='';
        }

        function hideLayers() {
	        document.getElementById('menu-aboutus').style.display='none';
	        document.getElementById('menu-glossary').style.display='none';
	        document.getElementById('menu-arabian').style.display='none';
	        }