function getbodypics($string, $num)
{
    preg_match_all("/<img([^>]*)s*src=('|")([^'"]+)('|")/",$string,$matches);
    $imgsrc_arr = array_unique($matches[3]);
    $count = count($imgsrc_arr);
    $i = 0;
    foreach($imgsrc_arr as $imgsrc)
    {
        if($i == $num) break;
        $result .= "<img src="$imgsrc"/>";
        $i++;
    }
    return $result;
}

[field:mypic2 function=getbodypics(@me,3)/]

{dede:field.mypic2 function=getbodypics(@me,3)/}