Ciao simoneudine,
devi aggiungere scrollbars=1
codice:
$ctime = filectime("$picdir/$dir/$a_img[$x]");
     if("$dir/$a_img[$x]" !="")
      print "<td align=center><a href=\"javascript:;\" onClick=\"window.open('$picdir/$dir/$a_img[$x]','','width=$imagehw[0],height=$imagehw[1],scrollbars=1')\" ><img src=\"$picdir/$dir/$a_img[$x]\" height=$height width=$width border=0></a>
$a_img[$x]</td>\n";