function showhide(name){
  if(document.getElementById(name).style.display == 'block')
    document.getElementById(name).style.display = 'none';
  else{
    document.getElementById('deliveries').style.display = 'none';
    document.getElementById('letters').style.display = 'none';
    document.getElementById('portfolio').style.display = 'none';
    document.getElementById(name).style.display = 'block';
  }
}
function popupw(page,width,height){
  window.open(page,'w1','top=150,left=100,titlebar=no,width='+width+',height='+height+',toolbar=no,directories=no,status=no,scrollbars=no,resize=no,menubar=no');
}
function popupwh(page,width,height){
  window.open(page,'w1','top=150,left=100,titlebar=no,width='+width+',height='+height+',toolbar=no,directories=no,status=no,scrollbars=yes,resize=no,menubar=no');
}
function showhide(id){
  if(document.getElementById(id).style.display == 'none')
    document.getElementById(id).style.display = 'block';
  else
    document.getElementById(id).style.display = 'none';
}