function getById(id){
 var nl=document.getElementById(id); 
 return (nl?nl:false);
}
var panels=3;
function showTab(name){
for(var i=1;i<=panels;i++){
  var tabSW = getById('tabSW'+i);
  var tabName = 'tab'+i;
  var tab = getById(tabName);
  if(tab && tabSW){
    if(tabName==name){
      tab.className='tab-act';
      tabSW.className='active';
    }else{
      tab.className='tab-iact';
      tabSW.className='';
    }
  }
 }
}