var curImg = 1;
var nxtImg = 2;
var maxId = 3;

$(document).ready(function() 
{
   function intervalTrigger() { 
      maxId = getMax();
      $("#flipImg1").fadeIn(2000);  
      setInterval( flipImage, 6000 ); 
   }; 
   intervalTrigger(); 
}); 

function getMax()
{
    for (i=1;i<10;i++)
    {
        var curNamet = "#flipImg" + i;
        if ($(curNamet).length>0) {
            maxId = i;
        }
    }
    return maxId;
}

function flipImage()
{
    var curName = "#flipImg" + curImg;
    var nxtName = "#flipImg" + nxtImg;
    
    $(curName).fadeOut(1000, function() {
        $(curName).hide();
        $(nxtName).fadeIn(1000);   
    });
    
    curImg++;
    if (curImg == (maxId+1)) curImg = 1;
    if (curImg < maxId) nxtImg = curImg + 1;
    else nxtImg = 1;
    
}