Need help getting THIS code into a plugin

[Mobo]

Thanks for the help kh99. Trying to follow what you suggested, I did this...

New template called exp_shop_tab containing:

<if condition="$block_data[xperience_points_shop]<>0">
		<fieldset class="vbexperience_group">
			<legend>$vbphrase[xperience_shop]</legend>
			<ul class="list_no_decoration">
				<li><span class="shade">$vbphrase[xperience_points_shop]:</span> $block_data[xperience_points_shop]</li>
			</ul>
			<table>
			<tr>
				$block_data[xperience_shop_items]			
			</tr>
			</table>
		</fieldset>
	</if>
	<if condition="$block_data[xperience_shop_items_received]	">
		<fieldset class="vbexperience_group">
			<legend>$vbphrase[xperience_shop_items_received]</legend>
			<table>
			<tr>
				$block_data[xperience_shop_items_received]			
			</tr>
			</table>
			
			
		</fieldset>
	</if>

Plugin edited to contain this code:

function prepare_output($id = '', $options = array())
	{
		eval('$this->block_data[mymodification] ="' . fetch_template('exp_shop_tab') . '";');
	}

That returns this error on my page (page still loads, but many tabs are missing and error message is at the top of the page):

Parse error: syntax error, unexpected T_VARIABLE, expecting T_FUNCTION in /hermes/web05/b980/pow.mobowow/htdocs/forums/member.php(463) : eval()'d code on line 307