// Roll Over
function initRollOverImages() {
  var image_cache = new Object();
  $("img.rollover").each(function(i) {
    var imgsrc = this.src;
    var dot = this.src.lastIndexOf('.');
    var imgsrc_on = this.src.substr(0, dot) + '_on' + this.src.substr(dot, 4);
    image_cache[this.src] = new Image();
    image_cache[this.src].src = imgsrc_on;
    $(this).hover(
      function() { this.src = imgsrc_on; },
      function() { this.src = imgsrc; });
  });
}

$(document).ready(initRollOverImages);

//スクロール
$(document).ready(function(){
	jQuery.easing.quart = function (x, t, b, c, d) {
    	return -c * ((t=t/d-1)*t*t*t - 1) + b;
	};
	$('a[href^="#"]').click(function(){
		var targetOffset = $($(this).attr("href")).offset().top;
		$('html,body').animate({scrollTop:targetOffset}, 1000, 'quart');
		return false;
	});
});