function tab_getbyid(id)
{
   itm = null;
   if (document.getElementById)
   {
      itm = document.getElementById(id);
   }
   else if (document.all)
   {
      itm = document.all[id];
   }
   else if (document.layers)
   {
      itm = document.layers[id];
   }
   
   return itm;
}
function tab_select(type)
{
  var type=type;
  if(type=='tab_con0')
  {
    tab_getbyid('tab_con0').style.display='block';
    tab_getbyid('tab_con1').style.display='none';
    tab_getbyid('tab_con2').style.display='none';
    tab_getbyid('tab_con3').style.display='none';
    tab_getbyid('tab_s0').className='tab_on';
    tab_getbyid('tab_s1').className='';
    tab_getbyid('tab_s2').className='';
    tab_getbyid('tab_s3').className='';
  }
  else if(type=='tab_con1')
  {
    tab_getbyid('tab_con0').style.display='none';
	tab_getbyid('tab_con1').style.display='block';
    tab_getbyid('tab_con2').style.display='none';
    tab_getbyid('tab_con3').style.display='none';
    tab_getbyid('tab_s0').className='';
    tab_getbyid('tab_s1').className='tab_on';
    tab_getbyid('tab_s2').className='';
    tab_getbyid('tab_s3').className='';
	  

  }
  else if(type=='tab_con2')
  {
    tab_getbyid('tab_con1').style.display='none';
    tab_getbyid('tab_con0').style.display='none';
    tab_getbyid('tab_con2').style.display='block';
    tab_getbyid('tab_con3').style.display='none';
    tab_getbyid('tab_s0').className='';
    tab_getbyid('tab_s1').className='';
    tab_getbyid('tab_s2').className='tab_on';
    tab_getbyid('tab_s3').className='';
  }
  else if(type=='tab_con3')
  {
    tab_getbyid('tab_con1').style.display='none';
    tab_getbyid('tab_con0').style.display='none';
    tab_getbyid('tab_con2').style.display='none';
    tab_getbyid('tab_con3').style.display='block';
    tab_getbyid('tab_s0').className='';
    tab_getbyid('tab_s1').className='';
    tab_getbyid('tab_s2').className='';
    tab_getbyid('tab_s3').className='tab_on';
  }
}