if (document.images)
{
	preload_image_object = new Image();
	// set image url
	image_url = new Array();
	image_url[0] = "../images/menu/homeact.png";
	image_url[1] = "../images/menu/biografieact.png";
	image_url[2] = "../images/menu/interessesact.png";
	image_url[3] = "../images/menu/contactact.png";
	image_url[4] = "../images/menu/archiefact.png";

	var i = 0;
	for(i=0; i<=4; i++)
	{
		preload_image_object.src = image_url[i];
	}
}