html - php option value link -

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i created dropdown menu , when click on option on category in drop down bar, can link product page, failed linked them, know problems in code?

enter code here 

$link=mysql_connect("localhost","root","")or die("can't connect..."); mysql_select_db("fyp",$link) or die("can't connect database..."); $query="select * category "; $res=mysql_query($query,$link);  while($row=mysql_fetch_assoc($res)) {     echo "<option value='product.php category=".$roww['$cat_id']."'>".$row['cat_nm'];///here problem     $qq = "select * subcat parent_id=".$row['cat_id'];     $ress = mysql_query($qq,$link) or die("wrong delete subcat query..");     while($roww = mysql_fetch_assoc($ress))     {         echo "<option value='".$roww['subcat_id']."'> ---> ".$roww['subcat_nm'];//here problems     }  }  mysql_close($link);  ?>

enter image description here

try , use mysqli instead of mysql, mysql deprecated(suggestion)

    $link=mysqli_connect("localhost","root","")or die("can't connect...");     mysqli_select_db($link,"fyp") or die("can't connect database...");     $query="select * category";     <select onselect='gourl(this.value)' id="cval" name="cval">     $res=mysqli_query($link,$query);      while($row=mysqli_fetch_assoc($res))     {        echo "<option value='".$row['cat_id']."'>".$row['maincatname']."</option>";         $qq = "select * subcat parent_id=".$row['cat_id'];         $ress = mysqli_query($link,$qq) or die("wrong delete subcat query..".mysqli_error($link));         while($roww = mysql_fetch_assoc($ress))         {             echo "----><option value='".$roww['subcat']."'>".$roww['subcatname']."</option>";         }     }     </select>      mysqli_close($link);      ?>     <script>     function gourl(catgry)     {     window.location.href='product.php?category='+catgry;     }     </script>

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