<?php
if ($link==1)
{
    print "<img src=\"img/root.png\">";
}
elseif ($link==2)
{
    print "<img src=\"img/root2.png\">";
}
else
{
    print "<img src=\"img/root3.png\">";
}
?>

this script always displayed root3.png. After an upload  onto a f2s.com server it was  displayed correct.