fixed #321.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@2332 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/resources/hudson/model/Slave/ComputerImpl/slave-agent.jnlp.jelly

 <j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson">
   <st:contentType value="application/x-java-jnlp-file" />
+  <j:new var="h" className="hudson.Functions" />
   <j:set var="rootURL"
          value="${request.scheme}://${request.serverName}:${request.serverPort}${request.contextPath}" />
 
@@ -9,7 +10,7 @@
   <l:isAdmin>
     <!-- See http://java.sun.com/j2se/1.5.0/docs/guide/javaws/developersguide/syntax.html for the syntax -->
     <jnlp spec="1.0+"
-        codebase="${rootURL}/computer/${it.node.nodeName}/">
+        codebase="${rootURL}/computer/${h.encode(it.node.nodeName)}/">
 
       <information>
         <title>Slave Agent for ${it.displayName}</title>