if (document.images){
    preload_image_object = new Image();
	
    // set image url
    image_url = new Array("images/en/home.gif", "images/en/about.gif", "images/en/portfolio.gif", "images/en/translation.gif", "images/en/projects.gif", "images/en/contact.gif", "images/de/home.gif", "images/de/about.gif", "images/de/portfolio.gif", "images/de/translation.gif", "images/de/projects.gif", "images/de/contact.gif", "images/fr/home.gif", "images/fr/about.gif", "images/fr/portfolio.gif", "images/fr/translation.gif", "images/fr/projects.gif", "images/fr/contact.gif");
    
    var i = 0;
	
		for (i=0; i<=3; i++) {
			preload_image_object.src = image_url[i];
		}
}