var selected = "";

function ToggleDisplay(projectId)
{
   project = document.getElementById(projectId);
   if (selected != "") {
      selected.style.display = "none";
   }

   if (selected != project) {
      selected = project;

      if (selected.style.display == "none") {
              selected.style.display = "";
      }
      else {
              selected.style.display = "none";
      }
   }
   else {
      selected = "";
   }
}