How to put ads next to content

Hi I want to know how to put my adsense ads beside content. I know i can use

<?php

$paragraphAfter= 0; //display after the first paragraph

$content = apply_filters('the_content', get_the_content());

$content = explode("</p>", $content);

for ($i = 0; $i <count($content); $i++ ) {

if ($i == $paragraphAfter) { ?>

<div><script type="text/javascript"><!--
google_ad_client = "ca-pub-1899371351571952";
/* Content head */
google_ad_slot = "2921193851";
google_ad_width = 336;
google_ad_height = 280;
//-->
</script>
<script type="text/javascript"
src="https://pagead2.googlesyndication.com/pagead/show_ads.js">
</script></div>

<?php }

echo $content[$i] . "</p>";

} ?>

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to make ads appear through out it but it does not make it look like it is part of the content like i want it to. it just makes a blank block and inserts the ad there. i want to make the ad flow into the content like a picture would, beside my content