img2 = new Image()


seconds = "10";

function imgOne()
{
setTimeout("imgTwo()", seconds * 1000);
}
function imgTwo()
{
document.img_one.src = 'http://gascentral.com.au/templates/GasCentral/images/brown/frontpage_bg_two.jpg';
setTimeout("imgThree()", seconds * 1000);
}
function imgThree()
{
document.img_one.src = 'http://gascentral.com.au/templates/GasCentral/images/brown/frontpage_bg_three.jpg';
setTimeout("imgOne()", seconds * 1000);
}