andkon

Solved:

wp-includes –> post-template.php –>

function prepend_attachment($content) {
	$p = '<p class="attachment">';
	$p .= get_the_attachment_link(false, true, array(400, 300));
	$p .= '</p>';
	$p = apply_filters('prepend_attachment', $p);

	return "$p\n$content";
}

Change the array(x,y) to whatever maximum value you want!

Anyone? Help would be much appreciated!