function showTab(tab_id){
  var i = 1;
  while (document.getElementById('tab-'+i)){
	if (i==tab_id){
      document.getElementById('tab-'+i).className = 'tab open';
	  var divElem = document.getElementById('tab-'+i);
	  var aElem = divElem.getElementsByTagName('a')[0];
	  aElem.blur();
	  document.getElementById('tab-'+i+'-content').style.display = 'block';
	  if (document.getElementById('tab-'+i+'-content-2')){
		  document.getElementById('tab-'+i+'-content-2').style.display = 'block';
	  }
	} else {
	  document.getElementById('tab-'+i).className = 'tab';
	  document.getElementById('tab-'+i+'-content').style.display = 'none';
	  if (document.getElementById('tab-'+i+'-content-2')){
		  document.getElementById('tab-'+i+'-content-2').style.display = 'none';
	  }	  
	}
	i++;
  }
}