diff --git a/theme/base/style/core.css b/theme/base/style/core.css
index ba092c08caf..bdd3a19ee06 100644
--- a/theme/base/style/core.css
+++ b/theme/base/style/core.css
@@ -541,7 +541,7 @@ body.tag .managelink {padding: 5px;}
 /**
  * Help Content (pop-up)
  */
-#helppopupbox {background-color: #eee; border: 1px solid #848484;}
+#helppopupbox {background-color: #eee; border: 1px solid #848484;z-index: 10000;}
 #helppopupbox .yui3-widget-hd {float:right;margin:3px 3px 0 0;}
 #helppopupbox .yui3-widget-bd {margin:0 1em 1em 1em;border-top:1px solid #eee;}
 #helppopupbox .helpheading {font-size: 1em;}