$(document).ready(function() {

    
      var pos_left = 0;
      
      $("#gallery-scroll-right").click(
        function()
        {
          var szerokosc = $("#gallery-scroll-holder").width();
          if(pos_left > (665-parseInt(szerokosc)))
          {
            
            pos_left = pos_left-100;
            
            $("#gallery-scroll-holder").animate({marginLeft: pos_left});
          }
        }
      );
      
      $("#gallery-scroll-left").click(
        function()
        {
          
          if(pos_left<0)
          {
            pos_left = pos_left+100;
            $("#gallery-scroll-holder").animate({marginLeft: pos_left});
          }
        }
      );
 });