function tabSwitch(new_tab, new_content, new_tabhlink) {   
       
    document.getElementById('content_1').style.display = 'none';   
    document.getElementById('content_2').style.display = 'none';   
    document.getElementById('content_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'; 
	
	document.getElementById('tab_1hlink').className = '';   
    document.getElementById('tab_2hlink').className = '';   
    document.getElementById('tab_3hlink').className = '';           
    document.getElementById(new_tabhlink).className = 'activehlink';   
  
}