/*
 Btn Class v1.1
 update 2007.12.10
 create K.Kubonaka 
*/

function Btn(elm) {
	var me = this;
	this.elm = elm;
	this.over = function() { me.changeImage(true); };
	this.out = function() {	me.changeImage(false); };
	this.init();
}

var _Btn = Btn.prototype;

_Btn.init = function() {
	var me = this;
	var img_on = new Image();
	var img_str = this.elm.getAttribute("src");
	img_on.src = img_str.replace("_off", "_on");
	this.setEvent();
};


_Btn.doSelect = function() {
	this.deleteEvent();
	this.changeImage(true);
};


_Btn.setEvent = function() {
	try {
		this.elm.addEventListener("mouseover", this.over, false);
		this.elm.addEventListener("mouseout", this.out, false);
	} catch(e) {
		this.elm.attachEvent("onmouseover", this.over);
		this.elm.attachEvent("onmouseout", this.out);
	}
};


_Btn.deleteEvent = function() {
	try {
		this.elm.removeEventListener("mouseover", this.over, false);
		this.elm.removeEventListener("mouseout", this.out, false);
	} catch(e) {
		this.elm.detachEvent("onmouseover", this.over);
		this.elm.detachEvent("onmouseout", this.out);
	}
};


_Btn.changeImage = function(flag) {
	var img = this.elm.getAttribute("src");
	this.elm.setAttribute("src", (flag) ? img.replace("_off", "_on") : img.replace("_on", "_off"));
};


/*
 roSetter v1.1
 update 2007.12.10
 create K.Kubonaka 
*/

(function(func) {
	try {
		window.addEventListener("load", func, false);
	} catch(e) {
		window.attachEvent("onload", func);
	}
})(function() {
	var btnArray01 = document.getElementsByTagName("img");
	var btnArray02 = document.getElementsByTagName("input");
	for (var i = 0, ln = btnArray01.length; i < ln; i++) {
		if (btnArray01[i].getAttribute("src").indexOf("_off.") >= 0) new Btn(btnArray01[i]);
	}
	for (var i = 0, ln = btnArray02.length; i < ln; i++) {
		try{
			if (btnArray02[i].getAttribute("src").indexOf("_off.") >= 0) new Btn(btnArray02[i]);
		} catch(e){
		}
	}
});


//Page Top
function gotoTop(){
  window.scrollTo(0,0);
}


//top画像読み込み
 function randMainImg(){	
	var img = new Array();
	img[0] = "img/img_main_01.jpg";
	img[1] = "img/img_main_02.jpg";
	rnd = (Math.random() * 10000000000000) % 2 >> 0;
	//rnd = Math.floor(Math.random() * img.length);
	var tg = document.getElementById("mainImage");
	var str = "<img src='" + img[rnd] + "' alt='AURORA  AURORA is a new secure and efficient cryptographic hash algorithm family, which is now evaluated as a SHA-3 candidate.' width='710' height='180'>";
	//document.write("<img src='",img[rnd],"'>");
	//tg.style.display = "block";
	//tg.setAttribute("href", url[rnd]);
	tg.innerHTML = str;
}