var visual1;
var visual2;
var visual3;
var $flag;
var i = 0;
var ii = 0;
var iii = 0;
var iiii = 0;

var strUA = "";
strUA = navigator.userAgent.toLowerCase();
var firefox = 0;

// if(strUA.indexOf("firefox") != -1){
// 	firefox = 1;
// }


window.onload = function(){
setInterval("swapPhoto(flag_loop)", 4000);
}
// 画像を交互に入れ替えるための関数
function swapPhoto(flag_loop){
if(flag_loop == 1){
	if($flag == 2){
		ii++;  
		
		document.getElementById('visual1').style.display = "none";
		document.getElementById('visual2').style.display = "none";
        document.getElementById('visual3').style.display = "block";
		
		if(document.images) {  
			if(firefox != 1){
			document.visual3img.src = 'images/index/flash1231/3.gif' + '?' +5000+ ii;  
			}
		}
		$flag=3;


	}else if($flag == 3){
		iii++;  
		
		document.getElementById('visual1').style.display = "block";
		document.getElementById('visual2').style.display = "none";
        document.getElementById('visual3').style.display = "none";
		$flag=1;

	}else{
		i++; 
        document.getElementById('visual1').style.display = "none";
		document.getElementById('visual2').style.display = "block";
        document.getElementById('visual3').style.display = "none";
		if(document.images) {  
			if(firefox != 1){
			document.visual2img.src = 'images/index/flash1231/2.gif' + '?' +5000+ i;  
			}
		}
		
		$flag=2;
      }
}

}