diff --git a/rdf/projekttask.rdf.php b/rdf/projekttask.rdf.php
index 17f213031..5345e5970 100755
--- a/rdf/projekttask.rdf.php
+++ b/rdf/projekttask.rdf.php
@@ -52,7 +52,7 @@ foreach($projekttask_obj->result as $projekttask)
 	$oRdf->obj[$i]->setAttribut('beschreibung',$projekttask->beschreibung);
 	$oRdf->obj[$i]->setAttribut('aufwand',$projekttask->aufwand);
 	$oRdf->obj[$i]->setAttribut('mantis_id',$projekttask->mantis_id);
-	$oRdf->obj[$i]->setAttribut('erledigt',$projekttask->erledigt);
+	$oRdf->obj[$i]->setAttribut('erledigt',($projekttask->erledigt?'true':'false'));
 	$oRdf->obj[$i]->setAttribut('projekttask_fk',$projekttask->projekttask_fk);
 	
 	if($projekttask->projekttask_fk!='')
diff --git a/skin/images/cbox-check.gif b/skin/images/cbox-check.gif
new file mode 100755
index 000000000..fa0b1964f
Binary files /dev/null and b/skin/images/cbox-check.gif differ
diff --git a/skin/images/round.png b/skin/images/round.png
new file mode 100755
index 000000000..a62a523d6
Binary files /dev/null and b/skin/images/round.png differ
diff --git a/skin/planner.css b/skin/planner.css
index 9b36f0bdd..028e7a57c 100755
--- a/skin/planner.css
+++ b/skin/planner.css
@@ -51,7 +51,7 @@ treechildren::-moz-tree-cell-text(odd, selected) { color: #000000; }
 treechildren::-moz-tree-checkbox 
 {
   /* unchecked checkbox treecells. This style MUST come before treechildren::-moz-tree-checkbox(checked) otherwise it won't take effect.  */
-  list-style-image: url("../skin/images/false_red.png");
+  list-style-image: url("../skin/images/round.png");
 }
 
 treechildren::-moz-tree-checkbox(checked)
@@ -59,5 +59,5 @@ treechildren::-moz-tree-checkbox(checked)
   /* css for checked cells. cbox-check.gif isn't available in Firefox 1, 2, and 3 on Mac OS X, so you should specify a URL to an image
      in your extension or elsewhere. */
   /*list-style-image: url("chrome://global/skin/checkbox/cbox-check.gif");*/
-  list-style-image: url("../skin/images/true_green.png");
+  list-style-image: url("../skin/images/cbox-check.gif");
 }
\ No newline at end of file