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The dropdown menus in System -> Blocks do not control who can see what block. If you read its label it says:
Quote:
Show blocks visible in: [Module] Group [Group List]
If you what to adjust which groups can see which blocks, you'll want to go to System -> Groups, and modify the groups that should not see the block.
One word of caution before you run out to do so. The who's online block is not completely real-time, it's written to remove stale records a fraction of the times it is displayed in the page. This means that if it is only displayed for webmasters it will be updated even less than normal, usually causing your number of users online to appear much higher than it really is. A better trick is to add the block to the page, but hide it in the smarty templates. Please note that this is highly theme specific and may need to be modified before it works on your site. The concepts are still the same however.
Using the default theme, let's say you want the "Who's Online" block to display on the left sidebar.
Modify the file /themes/default/theme_blockleft.html, changing this:
<div class="blockTitle"><{$block.title}>div>
<div class="blockContent"><{$block.content}>div>
to:
<{if $block.title eq "Who's Online"}>
<{if $xoops_isadmin eq 1}>
<div class="blockTitle"><{$block.title}>div>
<div class="blockContent"><{$block.content}>div>
<{/if}>
<{else}>
<div class="blockTitle"><{$block.title}>div>
<div class="blockContent"><{$block.content}>div>
<{/if}>
The change above causes the Who's Online block to be run on each page, but only displayed for admins. Of course, if you later decide that you want to move the block to the right sidebar you'd need to make these same changes to /themes/default/theme_blockright.html
