$(document).ready(
  function() {
    $('.colore_zoom').click(
      function() {
        $(this).hide().addClass('colore-nascosto');
      }
    )
    $('.colore_img').click(
      function() {
        
        var array_idimg = $(this).attr('id').split('_');
        
        var colori_zoom_width = $('#iddiv_' + array_idimg[1]).width();
        var document_width    = $(document).width();
        
        var differenza_width  = document_width-colori_zoom_width;
        var zoom_left         = differenza_width/2;

        var position = $(this).position();

        var colori_zoom_height= $('#iddiv_' + array_idimg[1]).height();
        
        var zoom_top          = position.top-(colori_zoom_height/2);
        
        if ($('#iddiv_' + array_idimg[1]).hasClass('colore-nascosto')) {
          $('#iddiv_' + array_idimg[1]).removeClass('colore-nascosto');
          $('#iddiv_' + array_idimg[1]).css('top', zoom_top);
          $('#iddiv_' + array_idimg[1]).css('left', zoom_left).fadeIn(400);
        }else{
          $('#iddiv_' + array_idimg[1]).addClass('colore-nascosto');
        }
      }
    )
  }
)