var currentImage = null;

function nextImage(){
         if(headerImages.length < 2){
                 window.clearInterval(irt);
                 return;
         }
         var headerImage = document.getElementById("headerImage");

         var next = headerImages[0];

         for(i = 0; i < headerImages.length; i++){
                 if(headerImages[i] == currentImage && i < headerImages.length - 1){
                         next = headerImages[i+1];
                         break;
                 }
         }
         currentImage = next;
         headerImage.style.backgroundImage = "url(" + projectPath + "/static/custom/image/Home_image_" + next + ".jpg)";
}

var irt = window.setInterval("nextImage()",10000);