var pic = "";

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

foto = function(pic){
rollpic('image', 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 + ")";
}

function newwin(location,name,w,h){
var scrw=(screen.width/2)-(w/2);
var scrh=(screen.height/2)-(h/2);
window.open(location,name,'left='+scrw+',top='+scrh+',width='+w+',height='+h);
}
function fullscreen(url){
w = screen.availWidth;
h = screen.availHeight;
features = "width = " + w + " , height = " + h;
features += ", left = 0 , top = 0 , screenX = 0 , screenY = 0";
window.open(url, "", features);
}