function show(id) {
         var row = document.getElementById(id);
            if (row.style.display == "block") {
                row.style.display = "none";
				document.getElementById("a_"+id).innerHTML = "<img src='img/plus.jpg'>";
			}
            else if (row.style.display == "none") {
                row.style.display = "block";
				document.getElementById("a_"+id).innerHTML = "<img src='img/minus.jpg'>";
			}
        }