var curImage=0;
var seconds=10;
function changeImage()
{
curImage=curImage+1;
if (curImage==1)
{
   img1.style.display='none';
   img2.style.display='block';
   img3.style.display='none';
   setTimeout("changeImage()", 10000);
   seconds=10;
}
else if (curImage==2)
{
   img1.style.display='none';
   img2.style.display='none';
   img3.style.display='block';
   setTimeout("changeImage()", 10000);
   seconds=10;
}
else if (curImage==3)
{
   img1.style.display='block';
   img2.style.display='none';
   img3.style.display='none';
   curImage=0;
   setTimeout("changeImage()", 10000);
   seconds=10;
}
}