var img1 = new Image();img1.src = "/images/plus.gif";
     var img2 = new Image();img2.src = "/images/minus.gif";
     
     function doOutline(e)
          {
          var srcId, srcElement, targetElement;
          if (e) {
               srcElement = e.target;
          }
          else srcElement = window.event.srcElement;          
          if (srcElement.className == "item")
               {
               srcID = srcElement.id.substr(1, srcElement.id.length-1);
			   targetElement = document.getElementById("s" + srcID);
			   srcElement = document.getElementById("i" + srcID);
               if (targetElement.style.display == "none")
                    {               
                    targetElement.style.display = "";
                    if (srcElement.className == "item") srcElement.src = img2.src;
                    }
               else
                    {
                    targetElement.style.display = "none";
                    if (srcElement.className == "item") srcElement.src = img1.src;
                    }
               }
          }
     
     document.onclick = doOutline;