Inser my banner into an echo

Hi,

i have change the code to of my header template cause i need ton insert banners only on category.php.

the code :

<?php
if (is_home()) {
               echo "HOMEPAGE";
} elseif (is_category()) {
         //echo "CATEGORIES";
// first echo doesn't works
echo "<div id='banniereHeader'>[wp_bannerize('group=header&limit=1&random=1');]</div>";
// 2nd echo doesn't works too
echo "<div id='banniereHeader'>
<?php wp_bannerize('group=header&limit=1&random=1');?></div>";
} elseif (

etc...
?>

before i only used <div id='banniereHeader'>
<?php wp_bannerize('group=header&limit=1&random=1');?></div> without "echo"

so i don’t know how to make this code compatible,

thanks for your tips ??

https://www.ads-software.com/extend/plugins/wp-bannerize/