var pic = "";

rollpic = function (img_name, img_src) {
document[img_name].src=img_src;
}

foto = function(pic){
rollpic('image', '../../foto/' + pic + '.jpg');
}

mapa = function(pic){
rollpic('image', '../../img/' + pic + '.png');
}

fade = function (id, opacity) {
var object = document.getElementById(id).style;
object.opacity = (opacity / 100);
object.MozOpacity = (opacity / 100);
object.KhtmlOpacity = (opacity / 100);
object.filter = "alpha(opacity=" + opacity + ")";
}