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There are many ways to do the "announcement" block.
Some are "manual" and don't change - others change automatically when new content is posted in a module or modules.
So the solution for you depends more on what exactly you need.
Anyway, here are a few alternatives for you to explore.
1. Custom block
You can create a custom block that will hold any content you want. Image, text, both. HTML. We use them for content that does not need to change much. General welcome text, mission statements, etc. On the XOOPs.org site it think the "Welcome to the Official XOOPS website!" block is a custom block with static content.
2. Module Block
On the XOOPs.org site, the "Latest XOOPS news" is most likely a "recent news" block of the News module. On the home page of the site, this block automatically pulls the title and article intro from the most recent news module posting. This block is also configure to show recent article titles from specific categories of news articles.
3. Cross Module Block
There is also a module called "What's New" which looks at other modules and pull recent postings and lists them. The What's New module has many admin configs so admin can control which modules it pull from, how it summarizes content ect.
Hope this helps.
Andy Cleff
Ampersand Design, Inc
Doylestown, PA
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Helping our clients bring great ideas into shape through integrated marketing, creative branding, print and web strategy, online learning and e-commerce.
http://www.ampersandesign.net