function tabSwitchvoid(new_tab, new_content) {  
  
    document.getElementById('bilde_1').style.display = 'none';  
    document.getElementById('bilde_2').style.display = 'none';  
    document.getElementById('bilde_3').style.display = 'none';  
    document.getElementById(new_content).style.display = 'block';     
  
    document.getElementById('tab_1').className = '';  
    document.getElementById('tab_2').className = '';  
    document.getElementById('tab_3').className = '';  
    document.getElementById(new_tab).className = 'active';        
  
}
function tabSwitch_2(active, number, tab_prefix, content_prefix) {  
  
    for (var i=1; i < number+1; i++) {  
      document.getElementById(content_prefix+i).style.display = 'none';  
      document.getElementById(tab_prefix+i).className = '';  
    }  
    document.getElementById(content_prefix+active).style.display = 'block';  
    document.getElementById(tab_prefix+active).className = 'active';      
  
}