var swsw;
var topMainImg;
var topMainH2;
var image = new Array();
var opop;
var tmtm;
var defBG;
function initswswImg() {
	topMainImg = document.getElementById("topMainImg");
	topMainH2 = document.getElementById("topMainH2");
	defBG = "./common/unit_img/toppage/main_img_bg.jpg";
	image[0] = "./common/unit_img/toppage/main_img1.jpg";
	image[1] = "./common/unit_img/toppage/main_img2.jpg";
	swsw = 0;
	opop = 100;
//	swswImg();
	setTimeout("swswImg()",6000);
}
function swswImg(){
	opop = 100;
	tmtm = setInterval("fadeout()",1);
	setTimeout("swswImg()",6000);
}
function swswImg2(){
	opop = 1;
	if( swsw == 1 ){
		swsw = 0;
	}
	else {
		swsw = swsw+1
	}
	topMainImg.src = image[swsw];
	tmtm = setInterval("fadein()",1);
}

function fadeout(){
	opop = opop - (opop*0.1);
	// Internet Explorer用
	topMainImg.style.filter = "alpha(opacity="+opop+")";
	// Firefox用
	topMainImg.style.MozOpacity = opop/100;
	// Safari用
	topMainImg.style.opacity = opop/100;
	
	if(opop < 1) {
		clearInterval(tmtm);
		topMainImg.src = defBG;
		swswImg2();
	}
}
function fadein(){
	opop = opop + (opop*0.1);
	// Internet Explorer用
	topMainImg.style.filter = "alpha(opacity="+opop+")";
	// Firefox用
	topMainImg.style.MozOpacity = opop/100;
	// Safari用
	topMainImg.style.opacity = opop/100;
	
	if(opop > 100) {
		clearInterval(tmtm);
	}
}

try{
	window.addEventListener("load",initswswImg,false);
}catch(e){
	window.attachEvent("onload",initswswImg);
}