http://cutesoft.net/example/backgroundimage.aspx

Editor setting:

<CE:Editor  EditorWysiwygModeCss="backgroundimage.css" runat="server"
></CE:Editor>
  
backgroundimage.css:
body
{
 background-image:url("/images/splash.jpg") ;
 background-repeat:no-repeat;
 background-position: center;
 background-color: red
} 

asp.net Chat http://cutesoft.net/ASP.NET+Chat/default.aspx
Web Messenger: http://cutesoft.net/Web-Messenger/default.aspx
asp.net wysiwyg editor: http://cutesoft.net/ASP.NET+WYSIWYG+Editor/default.aspx
asp wysiwyg html editor: http://cutesoft.net/ASP
asp.net Image Gallery: http://cutesoft.net/ASP.NET+Image+Gallery/default.aspx
Live Support: http://cutesoft.net/live-support/default.aspx