Index: /SPARQLBuilderWWW/web/jsgui.html
===================================================================
--- /SPARQLBuilderWWW/web/jsgui.html (revision 195)
+++ /SPARQLBuilderWWW/web/jsgui.html (revision 198)
@@ -130,4 +130,5 @@
 		$("*[name=selectendpoint]").append('<option value="' + ep[i] + '">' + ep[i]);
 	}
+	$("*[name=selectendpoint]").change(setEndpoint());
 }
 
@@ -153,4 +154,8 @@
 			$("*[name=startclass] option").remove();
 			$("*[name=endclass] option").remove();
+
+			$("*[name=startclass]").append('<option value="startclass">StartClass (Instance num)');
+			$("*[name=endclass]").append('<option value="endclass">EndClass (Path num)');
+
 			for (var i = 0; i < epclass.length; i++){
 				$("*[name=startclass]").append('<option value="' + epclass[i]["uri"] + '">' + epclass[i]["display"]);
@@ -173,33 +178,36 @@
 	MAXDEPTH = 0;
 
-	document.getElementById("selectpath").innerHTML = "";
-	document.getElementById("showpath").style.display = "none";
-
 	var selstart = $("*[name=startclass]").val();
 	var selend = $("*[name=endclass]").val();
 
-	ajaxload("view");
-	$.ajax({
-		type: "GET",
-		url : getPathListURL,
-		data: {
-		    ep: sel,
-		    startclass: selstart,
-		    endclass: selend
-		},
-		dataType: 'text',
-		success : function(nodes) {
-			jsontext = nodes;
-			pathlimit = 10;
-			view_map();
-			ajaxload("hide");
-			document.getElementById("graph").style.top = document.getElementById("menu").offsetHeight + "px";
-			document.getElementById("ajaxload").style.height = document.getElementById("menu").offsetHeight + "px";
-		},
-		error : function(XMLHttpRequest, textStatus, errorThrown) {
-			alert("繝ｪ繧ｯ繧ｨ繧ｹ繝域凾縺ｫ縺ｪ繧薙ｉ縺九�繧ｨ繝ｩ繝ｼ縺檎匱逕溘＠縺ｾ縺励◆�� + textStatus +":\n" + errorThrown);
-			ajaxload("hide");
-		}
-	});
+	if(selstart != "startclass" && selend != "endclass"){
+
+		document.getElementById("selectpath").innerHTML = "";
+		document.getElementById("showpath").style.display = "none";
+
+		ajaxload("view");
+		$.ajax({
+			type: "GET",
+			url : getPathListURL,
+			data: {
+			    ep: sel,
+			    startclass: selstart,
+			    endclass: selend
+			},
+			dataType: 'text',
+			success : function(nodes) {
+				jsontext = nodes;
+				pathlimit = 10;
+				view_map();
+				ajaxload("hide");
+				document.getElementById("graph").style.top = document.getElementById("menu").offsetHeight + "px";
+				document.getElementById("ajaxload").style.height = document.getElementById("menu").offsetHeight + "px";
+			},
+			error : function(XMLHttpRequest, textStatus, errorThrown) {
+				alert("繝ｪ繧ｯ繧ｨ繧ｹ繝域凾縺ｫ縺ｪ繧薙ｉ縺九�繧ｨ繝ｩ繝ｼ縺檎匱逕溘＠縺ｾ縺励◆�� + textStatus +":\n" + errorThrown);
+				ajaxload("hide");
+			}
+		});
+	}
 }
 
@@ -279,8 +287,8 @@
 			<form name="seclass">
 				StartClass<br>
-				<select size=1 name="startclass" style="width: 200px;">
+				<select size=1 name="startclass" style="width: 200px;" onChange="setSEClass()">
 				</select><br>
 				EndClass<br>
-				<select size=1 name="endclass" style="width: 200px;">
+				<select size=1 name="endclass" style="width: 200px;" onChange="setSEClass()>
 				</select><br>
 				<input type="button" name="setclass" value="SetClass" onClick="setSEClass()">