function openBranch( listing ) {
   document.getElementById( listing + "_closed" ).style.display="none";
   document.getElementById( listing + "_open" ).style.display="inline";
   return false;
}
function closeBranch( listing ) {
   document.getElementById( listing + "_open" ).style.display="none";
   document.getElementById( listing + "_closed" ).style.display="inline";
   return false;
}