change way to get the erp5 site url

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@44444 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_web_ung_theme/SkinTemplateItem/portal_skins/erp5_web_ung_theme/WebPage_shareDocument.xml

@@ -51,10 +51,14 @@
         <item>
             <key> <string>_body</string> </key>
             <value> <string>context.ERP5Site_userFollowUpWebPage(context.getReference())\n
+\n
 if context.getReference().startswith("default-"):\n
   context.setReference(DateTime().millis())\n
+\n
 context.share()\n
-return "%s/?key=%s" % (context.REQUEST.get("URL3"), context.getReference())\n
+base_url = context.getPortalObject().absolute_url()\n
+\n
+return "%s/?key=%s" % (base_url, context.getReference())\n
 </string> </value>
         </item>
         <item>

bt5/erp5_web_ung_theme/bt/revision

-304
\ No newline at end of file
+305
\ No newline at end of file