That is absolutely fine. Actually I tested a block with two rows of tabs stacked on each other like that, and one with three tabs on top and three on the bottom.
One thing though, with the newer code, you don't have to have the onload in the body tags. We are calling the js only from the blocks themselves. This way you don't get the js error(object required) when there is a page without the blocks. You have this error on your site.
So your new code might look like this:
Text Formatted Code
<div id='main1' class='block_tabs'>
<div onclick="getTabStuff('1')" class=tab id=tab_1>Online</div>
<div onclick="getTabStuff('2')" class=tab id=tab_2>New</div>
<div onclick="getTabStuff('3')" class=tab id=tab_3>Members</div>
<div id="tabtitle">Articles</div>
<div onclick="getTabStuff('4')" class=tab id=tab_4>New</div>
<div onclick="getTabStuff('5')" class=tab id=tab_5>Old</div>
<div onclick="getTabStuff('6')" class=tab id=tab_6></div>
</div>
<div id='mainHolder1'></div>
<script language='Javascript' type='text/javascript'>
initJavaScript('1', 'mainHolder', 'main', '1');
</script>
You would of course need the new tabthing.js file, and the css has changed a little too to make room for the ability to have more than one block.
Take a look at the new code, and you will see what I mean. I'm trying to make it easier for the technically challenged.
The plugin will make all this alot easier too. Although I'm having trouble deciding whether to make the block creation process like the existing block editor or more like Blaine's glmenu editor. Tough choice.
Anyways have fun - and more feedback is a must.
FlashYourWeb and Your Gallery with the E2 XML Media Player for Gallery2 -
http://www.flashyourweb.com