/*
 * Center plugin
 * By Karl Swedberg (http://www.learningjquery.com)
 */

(function($){
  $.fn.center = function(options) {
    var pos = {
      sTop : function() {
			return window.pageYOffset || $.boxModel && document.documentElement.scrollTop || document.body.scrollTop;
      },
      wHeight : function() {
			if ( $.browser.opera || ($.browser.safari && parseInt ($.browser.version) > 520) ) { 
				return window.innerHeight - (($(document).height() > window.innerHeight) ? getScrollbarWidth() : 0);
            } else if ( $.browser.safari ) {
                return window.innerHeight;
            } else {
				return $.boxModel && document.documentElement.clientHeight || document.body.clientHeight;
        	}
      },
      wWidth : function() {
			if ( $.browser.opera || ($.browser.safari && parseInt ($.browser.version) > 520) ) { 
				return window.innerWidth - (($(document).width() > window.innerWidth) ? getScrollbarWidth() : 0);
            } else if ( $.browser.safari ) {
                return window.innerWidth;
            } else {
				return $.boxModel && document.documentElement.clientWidth || document.body.clientWidth;
        	}
      }
    };
    return this.each(function(index) {
      if (index == 0) {
        var $this = $(this);
        var elHeight = $this.height();
        var elWidth = $this.width();
        $this.css({
          position: 'absolute',
          marginTop: '0',
          top: pos.sTop() + (pos.wHeight() / 2) - (elHeight / 2),
          left: (pos.wWidth() / 2) - (elWidth / 2)
        });
      }
    });
  };
})(jQuery);