function tabSwitch(active, number, tab_prefix, content_prefix) {  
  
    for (var i=1; i < number+1; i++) {
	// alert(document.getElementById(content_prefix+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';
  
}