Синтаксическая ошибка в запросе (syntax to use near '' at line 1)

<?php
if (!defined('BLOCK_FILE')) {
 Header("Location: ../index.php");
 exit;
}
 
global $CURUSER, $tracker_lang, $ss_uri;
 
  // Get current poll
$res = sql_query("SELECT * FROM polls ORDER BY added DESC LIMIT 1") or sqlerr(_FILE_,_LINE_);
  
  if($pollok=(mysql_num_rows($res))) {
          $arr = mysql_fetch_assoc($res);
          $pollid = $arr["id"];
          $userid = $CURUSER["id"];
          $question = $arr["question"];
          $o = array($arr["option0"], $arr["option1"], $arr["option2"], $arr["option3"], $arr["option4"],
            $arr["option5"], $arr["option6"], $arr["option7"], $arr["option8"], $arr["option9"],
            $arr["option10"], $arr["option11"], $arr["option12"], $arr["option13"], $arr["option14"],
            $arr["option15"], $arr["option16"], $arr["option17"], $arr["option18"], $arr["option19"]);
 
  // Check if user has already voted
          $res = sql_query("SELECT * FROM pollanswers WHERE pollid=$pollid AND userid=$userid") or sqlerr(__FILE__, __LINE__);
          $arr2 = mysql_fetch_assoc($res);
  }
 
  $blocktitle = $tracker_lang['poll'].(get_user_class() >= UC_MODERATOR ? "<font class=\"small\"> - [<a class=\"altlink\" href=\"makepoll.php?returnto=main\"><b>".$tracker_lang['create']."</b></a>]".($pollok ? " - [<a class=\"altlink\" href=\"makepoll.php?action=edit&pollid=$arr[id]&returnto=main\"><b>Редактировать</b></a>] - [<a class=\"altlink\" href=\"polls.php?action=delete&pollid=$arr[id]&returnto=main\"><b>Удалить</b></a>]" : "")."</font>" : "");
 
        if($pollok) {
          $content .= ("<p align=\"center\"><b>$question</b></p>\n");
          $voted = $arr2;
          if ($voted) {
            // display results
            if ($arr["selection"])
              $uservote = $arr["selection"];
            else
              $uservote = -1;
                        // we reserve 255 for blank vote.
            $res = sql_query("SELECT selection FROM pollanswers WHERE pollid=$pollid AND selection < 20") or sqlerr(__FILE__, __LINE__);
 
            $tvotes = mysql_num_rows($res);
 
            $vs = array(); // array of
            $os = array();
 
            // Count votes
            while ($arr2 = mysql_fetch_row($res))
              $vs[$arr2[0]] += 1;
 
            reset($o);
            for ($i = 0; $i < count($o); ++$i)
              if ($o[$i])
                $os[$i] = array($vs[$i], $o[$i]);
 
            function srt($a,$b) {
              if ($a[0] > $b[0]) return -1;
              if ($a[0] < $b[0]) return 1;
              return 0;
            }
 
            // now os is an array like this: array(array(123, "Option 1"), array(45, "Option 2"))
            if ($arr["sort"] == "yes")
                usort($os, srt);
 
            $content .= ("<table class=\"main\" align=\"center\" width=\"250\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n");
            $i = 0;
            while ($a = $os[$i]) {
              if ($i == $uservote)
                $a[1] .= "&nbsp;*";
              if ($tvotes == 0)
                      $p = 0;
              else
                      $p = round($a[0] / $tvotes * 100);
              if ($i % 2)
                $c = "";
              else
                $c = " bgcolor=\"#eeeeee\"";
              $content .= ("<tr><td width=\"1%\" class=\"embedded\"$c><nobr>" . $a[1] . "&nbsp;&nbsp;</nobr></td><td width=\"99%\" class=\"embedded\"$c><nobr>" .
                "<img src=\"./themes/$ss_uri/images/bar_left.gif\"><img src=\"./themes/$ss_uri/images/bar.gif\" height=\"12\" width=\"" . ($p * 3) .
                "\"><img src=\"./themes/$ss_uri/images/bar_right.gif\"> $p%</nobr></td></tr>\n");
              ++$i;
            }
            $content .= ("</table>\n");
            $tvotes = number_format($tvotes);
            $content .= ("<p align=\"center\">Голосов: $tvotes</p>\n");
          } else {
            $content .= ("<form method=\"post\" action=\"index.php\">\n");
            $i = 0;
            while ($a = $o[$i]) {
              $content .= ("<input type=\"radio\" name=\"choice\" value=\"$i\">$a<br />\n");
              ++$i;
            }
            $content .= ("<br />");
            $content .= ("<input type=\"radio\" name=\"choice\" value=\"255\">".$tracker_lang['blank_vote']."<br />\n");
            $content .= ("<p align=\"center\"><input type=\"submit\" value=\"".$tracker_lang['vote']."!\" class=\"btn\"></p>");
            $content .= ("</form>");
          }
        if ($voted)
          $content .= ("<div align=\"center\"><a href=\"polls.php\">".$tracker_lang['old_polls']."</a></div>\n");
        } else {
            $content .= "<table class=\"main\" align=\"center\" border=\"1\" cellspacing=\"0\" cellpadding=\"10\"><tr><td class=\"text\">";
            $content .= "<div align=\"center\"><h3>".$tracker_lang['no_polls']."</h3></div>\n";
            $content .= "</td></tr></table>";
        }
?>

if ($category != "") {
    $sql = "SELECT * FROM $table_name WHERE cat_id = $category ORDER BY name";
    $result = @mysql_query($sql,$connection) or die(mysql_error());
} else if ($dis == "name") {
    $sql = "SELECT * FROM $table_name ORDER BY name";
    $result = @mysql_query($sql,$connection) or die(mysql_error());
    $order = "Name";
} else if ($dis == "category") {
    $sql = "SELECT * FROM $table_name ORDER BY cat_id DESC";
    $result = @mysql_query($sql,$connection) or die(mysql_error());
    $order = "Category";
} else {
    $sql = "SELECT * FROM $table_name ORDER BY name";
    $result = @mysql_query($sql,$connection) or die(mysql_error());
} //end if

 $sql = "SELECT * FROM $table_name WHERE cat_id = $category ORDER BY name";

$sql = "SELECT * FROM $table_name WHERE cat_id = '$category' ORDER BY name";