/*

core.js

*/

(function($) {
	$.extend($.fx.step,{
	    backgroundPosition: function(fx) {
            if (fx.state === 0 && typeof fx.end == 'string') {
                var start = $.curCSS(fx.elem,'backgroundPosition');
                start = toArray(start);
                fx.start = [start[0],start[2]];
                var end = toArray(fx.end);
                fx.end = [end[0],end[2]];
                fx.unit = [end[1],end[3]];
			}
            var nowPosX = [];
            nowPosX[0] = ((fx.end[0] - fx.start[0]) * fx.pos) + fx.start[0] + fx.unit[0];
            nowPosX[1] = ((fx.end[1] - fx.start[1]) * fx.pos) + fx.start[1] + fx.unit[1];           
            fx.elem.style.backgroundPosition = nowPosX[0]+' '+nowPosX[1];
            
           function toArray(strg){
               strg = strg.replace(/left|top/g,'0px');
               strg = strg.replace(/right|bottom/g,'100%');
               strg = strg.replace(/([0-9\.]+)(\s|\)|$)/g,"$1px$2");
               var res = strg.match(/(-?[0-9\.]+)(px|\%|em|pt)\s(-?[0-9\.]+)(px|\%|em|pt)/);
               return [parseFloat(res[1],10),res[2],parseFloat(res[3],10),res[4]];
           }
        }
	});
})(jQuery);


$(document).ready(function() {

	var initPos = '0px 50%';
	var	offPos = '0px 90%';
	var	onPos = '0px 10%';
	var speed = 300;
	var on = false;
	$('#midbar div').css('background-position', initPos);
	$('#midbar ul > li > a')
		.css('background-position', initPos)
		.mouseover(function() {
			$(this).addClass('on');
			var p = $(this).parents().find("#midbar div");
			if (p.css('background-position') == offPos) on = true;
			p.stop().animate({
				backgroundPosition: '(' + offPos + ')'
			}, { duration: speed});
			$(this).stop().animate({
				backgroundPosition: '(' + onPos + ')'
			}, { duration: speed });
			
		})
		.mouseout(function() {
			var p = $(this).parents().find("#midbar div");
			p.stop().animate({
				backgroundPosition: '(' + initPos + ')'
			}, { duration: speed * 2});
			//if (on == true) initPos = offPos;
			$(this).stop().animate({
				backgroundPosition: '(' + initPos + ')'
			}, speed * 2, 'linear', function() {
				$(this).removeClass('on');
				on = false;
			});
			
		});
	;
	
	
	
});