(function($) {
  $.fn.centerMe = function(customOptions) {
      var options = $.extend({},$.fn.centerMe.defaultOptions, customOptions);

  		function viewport() {
     	var documentElement = document.documentElement;
     	var pageWidth = window.innerWidth || self.innerWidth || (documentElement && documentElement.clientWidth) || document.body.clientWidth;
     	var pageHeight = window.innerHeight || self.innerHeight || (documentElement && documentElement.clientHeight) || document.body.clientHeight;
     	var pageSize = [pageWidth, pageHeight];
     	// return pageSize;
			return pageSize[1];
  		}

			window.onresize = function() {
			center();
			}      

			function center() {
			var currentHeigh = viewport();
			var myPadding = Math.floor((currentHeigh-options.elementHeigh) / 2);
			if ( myPadding < 0 ) { myPadding = 0 } // avoid negative value because of IE7
			$('body').css('padding-top', myPadding + "px");
			} center();
  };
		
  $.fn.centerMe.defaultOptions = {
		elementHeigh: '440' // this value should be total height of the choosen element, include paddings if any.
  };

})(jQuery);