/* Funktion toggleLayer */

function toggleLayer(id)
{

	/* Variablen zuweisen */
	
	tab_item = 'tab' + id;
	tabnav_item = 'tabnav' + id;


	/* Layer schalten */
	
	if (document.getElementById(tab_item).style.display != 'block') 
	{
		if (document.getElementById('tab1').style.display = 'block') {
			document.getElementById('tab1').style.display = 'none';
			document.getElementById('tabnav1').style.backgroundColor = "#eee";
			document.getElementById('tabnav1').style.borderBottom = "none";
		}
		
		if (document.getElementById('tab2').style.display = 'block') {
			document.getElementById('tab2').style.display = 'none';
			document.getElementById('tabnav2').style.backgroundColor = "#eee";
			document.getElementById('tabnav2').style.borderBottom = "none";
		}	
		
        if (document.getElementById('tab3').style.display = 'block') {
        	document.getElementById('tab3').style.display = 'none';
        	document.getElementById('tabnav3').style.backgroundColor = "#eee";
			document.getElementById('tabnav3').style.borderBottom = "none";
        }
        
        if (document.getElementById('tab4').style.display = 'block') {
        	document.getElementById('tab4').style.display = 'none';
        	document.getElementById('tabnav4').style.backgroundColor = "#eee";
			document.getElementById('tabnav4').style.borderBottom = "none";
        }
        		
		document.getElementById(tab_item).style.display = 'block';
		document.getElementById(tabnav_item).style.backgroundColor = "#fff";
		document.getElementById(tabnav_item).style.borderBottom = "1px solid #fff";
	} 
	else 
	{
		// document.getElementById(tab_item).style.display = 'none';
	}
	
}