var flipDelay = 10000;
var flipCurrent_i;
//
var flipTimer;
var flipImages;
//
function flipInit()
{
var container = document.getElementById("flipcontainer");
flipImages = container.getElementsByTagName("img");
// ... find index of initial visible (if not defined)
if(typeof(flipCurrent_i)=="undefined")
{
for(var i=0;i<flipImages.length;i++){
if(flipImages[i].style.visibility){
flipCurrent_i = i;
break;
}
}
}
//..................................................
flipTimer = setInterval("flipFlop()",flipDelay);
}

function flipFlop()
{
flipImages[flipCurrent_i].style.visibility = ""
flipCurrent_i = ++flipCurrent_i % flipImages.length
flipImages[flipCurrent_i].style.visibility = "visible"
}