Random image showing

ok i have a site that needs to switch its header from a directory of several different jpgs randomly everytime the site is loaded.

the script i have in my html page is as follows:


<?php
    $randInt = rand(1, 8);
    echo "<img src="headerImages/head0" + $randInt + ".jpg">";
?>

filepath to an image is headerImages/head02.jpg

this returns the ever popular Parse error… what am i doing wrong??