var img = "t1.jpg,t2.jpg,t3.jpg,t4.jpg,t5.jpg,t6.jpg,t7.jpg,t8.jpg,t9.jpg,t10.jpg,t11.jpg,t12.jpg,t13.jpg";
var imgs = img.split(",");
var i=0;
var pic = new Array();

for(cnt=0; cnt<imgs.length; cnt++){
	pic[cnt] = new Image();
	pic[cnt].src = "http://www.flighthouse.com/para/images/" + imgs[cnt];
}

function imgChange(){
	i++;
	i%=imgs.length;
	document.getElementById("img1").src=pic[i].src;
}