Protect hiding/showing of targets.

diff --git a/experiments/spclient/mkws.js b/experiments/spclient/mkws.js
index 8c856f2..be9f10a 100644 (file)
--- a/experiments/spclient/mkws.js
+++ b/experiments/spclient/mkws.js
@@ -403,17 +403,17 @@ function switchView(view) {
 
     switch(view) {
         case 'targets':
-            targets.style.display = "block";
+            if (targets) targets.style.display = "block";
             if (results) results.style.display = "none";
             if (blanket) { blanket.style.display = "none"; }
             break;
         case 'results':
-            targets.style.display = "none";
+            if (targets) targets.style.display = "none";
             if (results) results.style.display = "block";
             if (blanket) { blanket.style.display = "block"; }
             break;
        case 'none':
-            targets.style.display = "none";
+            if (targets) targets.style.display = "none";
             if (results) results.style.display = "none";
             if (blanket) { blanket.style.display = "none"; }
             break;