function randam_image(name,num){
	var image_array = new Array(num);
	for(i=0; i<num; i++){
		image_array[i] = name + (i+1) + ".jpg";
	}
	var rand = Math.ceil(Math.random() * image_array.length) - 1;
	document.getElementById("bn_photo").src = "img/" + image_array[rand];
	//document.write('<img src="img/' + image_array[rand] + '" width="'+width+'" height="'+height+'" alt="">');
	document.close();
}