Add installer pop-help topic for URL scheme, in response to http://forum.enanocms.org/viewtopic.php?f=5&t=19
.mceItemFlash {
border: 1px dotted #cc0000;
background-image: url('../images/flash.gif');
background-position: center;
background-repeat: no-repeat;
background-color: #ffffcc;
}