/* check Browsers */
var macIE = false;
var winIE = false;
var macMozilla = false;
var winMozilla = false;
var winChrome = false;
var macChrome = false;
var macSafari = false;
var winSafari = false;
if(navigator.appVersion.indexOf("MSIE")!=-1){
	if(navigator.appVersion.indexOf("Mac")!=-1){
		macIE = true;
	}else{
		winIE = true;
	}
}else if(navigator.userAgent.indexOf("Firefox")!=-1){
	if(navigator.appVersion.indexOf("Windows")!=-1){
		winMozilla = true;
	}else{
		macMozilla = true;
	}
}else if(navigator.appVersion.indexOf("Chrome")!=-1){
	if(navigator.appVersion.indexOf("Windows")!=-1){
		winChrome = true;
	}else{
		macChrome = true;
	}
}else if(navigator.appVersion.indexOf("Safari")!=-1){
	if(navigator.appVersion.indexOf("Windows")!=-1){
		winSafari = true;
	}else{
		macSafari = true;
	}
}

/* 画像切り替え */
function writeImages(){
   var imglist = new Array(
                           "images/top/img_01.jpg",
                           "images/top/img_02.jpg"
                           );
   var selectnum = Math.floor((Math.random() * 100)) % imglist.length;
   document.write("<img src=" + imglist[selectnum] + ">");
}

/* メールアドレス生成 */
function writeEmail(){
	var mail="<img src=\"images/common/contact.gif\" alt=\"\" />";
	document.write(mail.link("mailto:" + "info" + "@birth-i" + ".com"));
}