Magento, show image on custom frontend block - image

Question

I've a module up and running. On the backend side I can upload images with several attributes and I'm saving image path and other information on a custom table. On frontend I already managed to detect when I need to show these images. I've used an Observer that adds a new layout handle when the displayed product is found on the custom created table. Then on that layout handle I call a phtml template file and from here I call a function inside a block that will be in charge of doing all the checks to be sure wich image to show.
My problem is that I can not find how to show these images. Everything I found references how to add image tag on a phtml file doing some extra verifications on the inserted php code. Buy on my case everything is on php code outside any phtml file.
My phtml file code:
<div>
<h3><?php $this->showCampaign(); ?></h3>
</div>
My block code for now:
<?php
class Dts_Banners_Block_Front extends Mage_Core_Block_Template {
/**
* Shows a campaign banner according to the current selected product
* Seeks on main banners table to see if it is an image/html/product alone campaign
* Once knows the campaign type search on needed table the needed fields
*/
public function showCampaign() {
//Zend_Debug::dump($this->getLayout()->getUpdate()->getHandles());
$product = Mage::registry('current_product');
$currentProdID = $product->getId();
if (Mage::registry('campaign_data') && Mage::registry('campaign_data')->getId()) {
$currentCampaign = Mage::registry('campaign_data');
} else {
return;
}
// get campaign type and show needed information
switch ($currentCampaign->getbanner_type()) {
case 1: // image
$myImgCollection = Mage::getModel('banners/bannersimg')->getCollection();
$myImgCollection->addfieldtofilter('bannerid',$currentCampaign->getID());
$currentImg = $myImgCollection->getFirstItem();
$currentImgPath = $currentImg->getimg_path();
//{{block type="catalog/product_new" product_id="16" template="catalog/product/view/your_new_page.phtml"}}
break;
case 2: // html
echo "html";
break;
case 3: // plain product url
echo "plain product url";
break;
}
}
}

Answer 1

As usual, couple of hours searching for an answer and when I post the question, found the answer. Just in case someone needs it: is as easy as creating an image html tag inside the code and return it to the template file. Sample code:
<?php
class Dts_Banners_Block_Front extends Mage_Core_Block_Template {
public function showCampaign() {
...
$currentImgPath = $currentImg->getimg_path();
//build html to output to the template
$html .= "<div class=\"visual\">";
$html .= "<img src=\"" . $currentImgPath . "\" alt=\"\" />";
$html .= "</div>";
....
return $html;
}
And the phtml file code:
<div class="visual">
<?php echo $this->showCampaign(); ?>
</div>