Page source:

// img: may be a URL or a string containing html for an image (with width and height parameters).

var finfo = (Wub_GetFunctionInfo(blogName) ? nil);
var module = (finfo.module ? wubinfo.user);
var res = nil;

var blogData = (WubEval(finfo.exec) ? nil);
var blogtitle = (blogData.title ? nil);
var entries = (blogData.entries ? nil);
var editname = (blogData.editname ? nil);
var editable = (blogData.editable ? "false");

if (blogData == nil) or (blogtitle == nil) or (entries == nil) then
   res = `Error: "` + blogName + `" does not appear to be a blog.`
elsif (editname == nil) and (editable == "false") then
   res = `Error: "` + blogName + `" does not appear to be an editable blog.\nIf this is a blog, you should add a field "editname"="<yourmodule.yourblogname>".`
end;

// No errors, continue
if res == nil then

   var id = (ToInt(entries[0].id) + 1 ? 1);
   var newEntry = [. title=title, content=entry,
                     postedby=wubinfo.user,
                     when=Wub_GetDateTimeStr(), id = id
                  .];
   if (img != nil) and (Str_Trim(img) != "") then
      if Str_IndexOf(`<img`, img) >= 0 then
         newEntry.image := img
      else
         newEntry.image := `<img src="` + img + `">`
      end
   end;

   blogData.entries := [newEntry] + blogData.entries;
   finfo.exec := ToSource(blogData);

   res = Wub_SaveFunctionInfo(finfo);
   // res = finfo
end;
res;