function setCounter(flag,stepwidth) {
  // Set Counter Value
  if(flag == 0) {
    image_count = image_count-stepwidth;
  } else {
    image_count = image_count+stepwidth;
  }
  
  
  $$('.image_box').each(function(item) {
    item.down('a').innerHTML='<img src="typo3conf/ext/user_projekt/res/images/quadrat_grau.gif" />'
  });
  
  // Show Image Description
    
    if(image_count >= image_total) {
      if ($('description')) $('description').innerHTML = image_text[image_total-1];
    } else {
      if ($('description')) $('description').hide();
      if ($('description')) $('description').innerHTML = image_text[image_count-1];
      if ($('description')) $('description').appear();       
    }
    
    // Active Icon
    act_count = image_count-1;
    old_count = image_count-2;

    if ($('box_'+image_count)) {
      $('box_'+image_count).down('a').innerHTML='<img src="typo3conf/ext/user_projekt/res/images/quadrat_grau.gif" height="15" width="15" />';
    }
        
    if ($('box_'+act_count)) {
      //alert(act_count);
      $('box_'+act_count).down('a').innerHTML='<img src="typo3conf/ext/user_projekt/res/images/quadrat_rot.gif" height="15" width="15" />';
    }
    
    if ($('box_'+old_count)) {
      $('box_'+old_count).down('a').innerHTML='<img src="typo3conf/ext/user_projekt/res/images/quadrat_grau.gif" height="15" width="15" />';
    }
    
    if (image_count > image_total) {
      $('box_0').down('a').innerHTML='<img src="typo3conf/ext/user_projekt/res/images/quadrat_rot.gif" height="15" width="15" />';
    }


  // Hide / Show Buttons
  if (image_count > 1) {
    if ($('prev_button')) $('prev_button').show();
  } else {
    if ($('prev_button')) $('prev_button').hide();
  }
  if (image_count < image_total) {
    if ($('next_button')) $('next_button').show();
  } else {
    if ($('next_button')) $('next_button').hide();
  }
  
}