function preImage(imgList){
	for(var i = 0; i < imgList.length; i++){
		var imgObj = new Image();
		imgObj.src = imgList[i];
	}
}
preImage([
	"/top/img/btn_promo_fortune.gif",
	"/top/img/btn_promo_fortune_on.gif",
	"/top/img/btn_promo_waza.gif",
	"/top/img/btn_promo_waza_on.gif",
	"/top/img/btn_promo_issue.gif",
	"/top/img/btn_promo_issue_on.gif"
	]
);

$(document).ready(function() {
	$('#slider').s3Slider({
		timeOut: 7000
	});
});

var activeNavi = function(naviObj){
	var targetClass = naviObj.className;
	if(targetClass.match(/navi\d{1}/)){
		var searchIndex = targetClass.search("navi");
		var currentNavi = targetClass.slice(searchIndex,searchIndex+5);
	}
	
	var sliderNumber = document.getElementById("sliderNumber");
	if(sliderNumber){
		switch(currentNavi){
			case "navi1":
				sliderNumber.className = "promo-btn active1";
			break;

			case "navi2":
				sliderNumber.className = "promo-btn active2";
			break;
			
			case "navi3":
				sliderNumber.className = "promo-btn active3";
			break;
			
			default:
				sliderNumber.className = "promo-btn active1";
			break;
		}
	}
}