php - Image Gallery -- select image which displays first -

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i have photo gallery based on jquery scrip[t from: http://coffeescripter.com/code/ad-gallery/.

images stored in mysql database. have page list of galleries, displays first 5 images each gallery. clicking @ of image moves gallery , starts displaying first image.

i in such way: if user clicks on second image, displaying should start second image, if user clicks on third image, displaying should start third image etc.

here code, have far:

/* galleries.php */     <?php         $idg = $_get["idg"];         if (file_exists(gallery.'galleries.php') && $idg == '')          {             require_once(gallery.'list_galleries.php');         }         else if (file_exists(gallery.'galleries.php') && $idg != '' )         {             require_once(gallery.'view_gallery.php');         }     ?>

/* list_galleries.php */

<?php      $sql_gal = "select id_g, nazwa page_gallery widok=1";     $res_gal = @mysql_query($sql_gal);     $n = mysql_num_rows($res_gal);      while ($row_gal = @mysql_fetch_array($res_gal)){          $galname = $row_gal["nazwa"];          $idg = $row_gal["id_g"];          $sql_gal_con = "select desc, img page_gallery_con             id_g='$idg' order order asc limit 5";         $res_gal_con = @mysql_query($sql_gal_con);           echo '<table class="gallerytable">';         echo '<tr >';         echo '<td colspan="4">';         echo '<a href="?p=13&idg='.$idg.'" class="galleryname" >'.$galname.'</a>';         echo '</td>';         echo '<td class="gallerycount">';         echo '</td>';         echo '</tr>';         echo '<tr class="galleryrow">';          while ($row_gal_con = @mysql_fetch_array($res_gal_con)){              $desc = $row_gal_con["desc"];             $img = $row_gal_con["img"];              echo '<td class="gallerycell">';                             echo '<a href="?p=13&idg='.$idg.'"><img src="'.gallery_dir.'min/'.$img.'" alt="'.$desc.'" /></a>';             echo '</td>';          }         echo '</tr>';         echo '</table>';     }  ?>

i have found proper solution based on tips http://webdev.plentyinfo.com/tag/ad-gallery/

just add if condition check if $_get variable set or not. example before second query change code this

 if(isset($_get['idg']))  $idg=$_get['idg'];  else  $idg = $row_gal["id_g"];

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