function showhideDiv(thediva, thedivb, thedivc) {
  displayDiv(thediva);
  hideDiv(thedivb);
  hideDiv(thedivc);
}

function hideDiv(thediv){
  if ($(thediv).is(":visible")) {
    $(thediv).slideUp("slow");
  }
}

function displayDiv(thediv){
  if ($(thediv).is(":hidden")) {
    $(thediv).slideDown("slow");
  } else {
    $(thediv).slideUp("slow");
  }
}