function showgrid(whichLayer) {
  document.getElementById('rcv_chart_show').style.display='none';
  document.getElementById('rcv_chart_hide').style.display='';  
  document.getElementById('rcv_comp_grid').style.display='';  
}

function hidegrid(whichLayer) {
  document.getElementById('rcv_chart_show').style.display='';
  document.getElementById('rcv_chart_hide').style.display='none';  
  document.getElementById('rcv_comp_grid').style.display='none';  
}