Well, I finally got it to work, thanks to an extensive search in the forums & I think a post by bassman plus some tinkering.

Here's what I did...

Opened theme_blockcenter_c.html and changed...

<div style="padding: 5px;">
<fieldset>
<legend class="blockTitle"><{$block.title}></legend>
<div class="blockContent"><{$block.content}></div>
</fieldset>
</div>

to

<div style="padding: 0px 5px 0px 5px;">
<div class="blockTitle"><{$block.title}></div>
<div class="blockContent"><{$block.content}></div>
</div>

Repeat this for theme_blockcenter_l.html and theme_blockcenter_r.html but no need to bother with removing the fieldset tags in those as it makes no difference.

then edit your theme CSS file at...

#centerCcolumn .blockTitle, #bottomCcolumn .blockTitle {
padding: 3px;
color: #000000;
font-weight: bold;
margin-top: 0px;
margin-right: 0px;
margin-left: 0px;
}

change to (without the image, unless you have one to use)...

#centerCcolumn .blockTitle, #bottomCcolumn .blockTitle {
background-image: url(blocktitlebar.gif);
padding: 3px;
color: #F89000;
font-weight: bold;
margin-top: 0px;
margin-right: 0px;
margin-left: 0px;
}


I still have some experimenting to do but so far, so good.

see it here www.gigaclix.com