var imageCounter = 1;

	function gallery() {
         	try{
               	    var imageArray = new Array("images/dummy2.jpg","images/black.jpg","images/hmslogo.jpg","images/black.jpg","images/dummy1.jpg","images/black.jpg","images/ajax-logo.jpg","images/black.jpg","images/xmlLogo.jpg");
                    imageCounter++;
                    if(imageCounter >= imageArray.length) {
                       imageCounter = 0;
                    }
                    document.getElementById("gallery").src = imageArray[imageCounter];
		    if(imageCounter == 1 || imageCounter == 3 || imageCounter == 5 || imageCounter == 7){
		       setTimeout(gallery, 200);
                    } else{
                       setTimeout(gallery, 3000);
		    }
		}  catch (error){
                      alert(error.message);
                }
     	}