var imageCount = 0;
var preloadImages = new Array();
var i = 0;
	
function preload(imageFile)
{
	imageCount++;
	preloadImages[imageCount] = new Image();
	preloadImages[imageCount].src = imageFile;
}

function changeImage() {
   
	preload('images/random/rdm_image_2.jpg');
	preload('images/random/rdm_image_3.jpg'); 
	preload('images/random/rdm_image_4.jpg');  
	
	var image = document.getElementById('changeimage');
	if (i == 0) {
//			alert('image_1');	
        image.src = 'images/random/rdm_image_1.jpg';
        i++;
    } else if (i < 3) {
//			alert('image_2');	
		image.src = preloadImages[i].src;
        i++;
    } else {
//			alert('image_3');	
		image.src = preloadImages[i].src;
        i = 0;
    }
    setTimeout('changeImage()', 4000);
}

function swap(event,button)
{
	if (event == "over")
	{
		document.getElementById (button).src = "images/menu/"+button+"_ov.jpg";
	}
	if (event == "out")
	{
		document.getElementById (button).src = "images/menu/"+button+".jpg";
	}
}

function changeRealisations (no_image){
	document.getElementById ('realisations').src = "images/realisations/"+no_image;
}