document.getElementById("tt").onclick=function(){
start();
}
document.getElementById("dd").onclick=function(){
stop();
}
var t ;
var chg = new Array();
chg[0]="images/chgimg1.jpg";
chg[1]="images/chgimg2.jpg";
chg[2]="images/chgimg3.jpg";
chg[3]="images/chgimg4.jpg";
function nextPT() {
alert(123)
var first = 1;
var last = chg.length;
var ppt = document.getElementById("news");
while (first <(last+1)){
if (first > last) {
first = 1;
} else {
first++;
}
ppt.src = chg[first - 1];
}
}
function start(){
t = setInterval('nextPT()',1000);
}
function stop(){
clearInterval(t)
}
