jquery.sliced.css

.sliced {
  position: relative;
  width: 640px; 
  height: 400px;
}
.tile { float: left; }

jquery.sliced.js

;(function( $, window ) {

  var _defaults = {
    x      : 2, // number of tiles in x axis
    y      : 2, // number of tiles in y axis
    random : true, // animate tiles in random order
    speed  : 2000 // time to clear all times
  };

  $.fn.sliced = function( options ) {

    var o = $.extend( {}, _defaults, options );

    return this.each(function() {

      var $container = $(this),
          width = $container.width(),
          height = $container.height(),
          $img = $container.find('img'),
          n_tiles = o.x * o.y,
          wraps = [], $wraps;

      for ( var i = 0; i < n_tiles; i++ ) {
        wraps.push('<div class="tile"/>');
      }

      $wraps = $( wraps.join('') );

      // Hide original image and insert tiles in DOM
      $img.hide().after( $wraps );

      // Set background
      $wraps.css({
        width: width / o.x,
        height: height / o.y,
        backgroundImage: 'url('+ $img.attr('src') +')'
      });
      
      // Adjust position
      $wraps.each(function() {
        var pos = $(this).position();
        $(this).css( 'backgroundPosition', -pos.left +'px '+ -pos.top +'px' );
      });

    });

  };

}( jQuery, window ));