// make it a plugin!
(function($) {
  $.fn.vCenter = function(options) {
    var pos = {
      sTop : function() {
        return window.pageYOffset 
        || document.documentElement && document.documentElement.scrollTop 
        ||  document.body.scrollTop;
      },
      wHeight : function() { 
        return window.innerHeight 
        || document.documentElement && document.documentElement.clientHeight 
        || document.body.clientHeight;
      }
    };
    return this.each(function(index) {
      if (index == 0) {
        var $this = $(this);
        var elHeight = $this.height();
        var elTop = pos.sTop() + (pos.wHeight() / 2) - (elHeight / 2);
        $this.css({
          position: 'absolute',
          marginTop: '0',
          top: elTop
        });
      }
    });
  };
 
})(jQuery); // end plugin