Display a warning message when Javascript is disabled

html/start.html

@@ -12,6 +12,12 @@ function enableInputs() {
     }
 }
 </script>
+<noscript>
+    <div style='color:red'>
+        <h1>Javascript Disabled</h1>
+        PDBFixer requires Javascript to operate.  Please enable Javascript in your browser, then reload this page.
+    </div>
+</noscript>
 <h1>Welcome To PDBFixer!</h1>
 Select a PDB file to load.  It will be analyzed for problems.
 <p>