// JavaScript Document


var NowImg = 1;
var MaxImg = 20;




function switchimg(){
	

	//var NowImg = NowImg + 1;
	
    if(NowImg == MaxImg+1) 
	{
		NowImg = MaxImg;
		NowImg = 1;
	}
    document.getElementById("tarImg").src = "images/" + "PS" + NowImg +".jpg";
	NowImg++;
}

window.onload = function initimg(){setInterval("switchimg()",2000)}