function toggleTabs ( tabName ) {
	if ( tabName == 'tab4' ) {
		document.getElementById('revtab').style.display = 'block'; 
		document.getElementById('infotab').style.display = 'block'; 
		document.getElementById('tab3').style.display = 'block';
		
		document.getElementById('revcontent').style.display = 'none'; 
		document.getElementById('infocontent').style.display = 'none'; 
		document.getElementById('tab3content').style.display = 'none'; 
				
		document.getElementById('revtabactive').style.display = 'none'; 
		document.getElementById('infotabactive').style.display = 'none'; 
		document.getElementById('tab3active').style.display = 'none';
		
	} else if ( tabName == 'tab3' ) {
		document.getElementById('revtab').style.display = 'block'; 
		document.getElementById('infotab').style.display = 'block'; 
		document.getElementById('tab3').style.display = 'none';
		
		document.getElementById('revcontent').style.display = 'none'; 
		document.getElementById('infocontent').style.display = 'none'; 
		document.getElementById('tab3content').style.display = 'block';
		
		document.getElementById('revtabactive').style.display = 'none'; 
		document.getElementById('infotabactive').style.display = 'none'; 
		document.getElementById('tab3active').style.display = 'block'; 
		
	} else if ( tabName == 'revtab' ) {
		document.getElementById('revtab').style.display = 'none'; 
		document.getElementById('infotab').style.display = 'block';
		document.getElementById('tab3').style.display = 'block';
 
		document.getElementById('revcontent').style.display = 'block'; 
		document.getElementById('infocontent').style.display = 'none'; 
		document.getElementById('tab3content').style.display = 'none'; 
		
		document.getElementById('revtabactive').style.display = 'block'; 
		document.getElementById('infotabactive').style.display = 'none'; 
		document.getElementById('tab3active').style.display = 'none'; 
		
	} else if ( tabName == 'infotab' ) {
		document.getElementById('revtab').style.display = 'block'; 
		document.getElementById('infotab').style.display = 'none'; 
		document.getElementById('tab3').style.display = 'block';
		
		document.getElementById('revcontent').style.display = 'none'; 
		document.getElementById('infocontent').style.display = 'block'; 
		document.getElementById('tab3content').style.display = 'none';  
		
		document.getElementById('revtabactive').style.display = 'none'; 
		document.getElementById('infotabactive').style.display = 'block'; 
		document.getElementById('tab3active').style.display = 'none'; 
		
	}
}