var d = document;
var header;
var headerWidth;
var headerHeight;
var posX;
var posY;
var nx=1;
var ny=1;
var velocidad = 30;
var timer;

function initialize() {
    header=d.getElementById('headerMove');

    largeur = (navigator.appName != "Microsoft Internet Explorer")? window.innerWidth : document.body.offsetWidth;
    hauteur = (navigator.appName != "Microsoft Internet Explorer")? window.innerHeight : document.body.offsetHeight;

    headerWidth = (navigator.appName != "Microsoft Internet Explorer")? header.clientWidth : header.offsetWidth;
    headerHeight= (navigator.appName != "Microsoft Internet Explorer")? header.clientHeight : header.offsetHeight;

    posX = -1207/2;
    poxY = -553/2;
}

function ejecutar() {
    header.style.backgroundPosition = posX + 'px ' + poxY + 'px';

    if ((posX) >= 0) nx = -1;
    if ((poxY) >= 0) ny = -1;
    if ((posX+1207) <= headerWidth) nx = 1;
    if ((poxY+553) <= headerHeight) ny = 1;

    posX += nx;
    poxY += ny;
    timer=setTimeout('ejecutar()',velocidad);
}

var times = 0
var velocity = 89
function latir(img){
    if(img.height <= 44){
        size = 1
        expand = true
    }
    else
    if(img.height >= 50){
        times++;
        size = -1
    }

    img.height+=size
    if (times < 5){
        if (times == 4 && expand)
            velocity+=3;
        setTimeout('latir(img)',velocity);
    }
}