// JavaScript Document

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

var fundo= new Array();

var local= new String();
local='http://www.contabilfonseca.com.br/';

fundo[0]="img/back_01.jpg";
fundo[1]="img/back_02.jpg";
fundo[2]="img/back_03.jpg";
fundo[3]="img/back_04.jpg";

var random = Math.floor(4 * Math.random());

MM_preloadImages(local+fundo[random]);

var img = document.getElementById('backgroundImage'),
    steps = 30,
    appearTime = 1000;

img.src = local+fundo[random];

img.onload = function(){
    for(i=0; i<=1; i+=(1/steps)){
        setTimeout((function(x){
            return function(){
                img.style.opacity = x;
                img.style.MozOpacity = x;
                img.style.KhtmlOpacity = x;
                img.style.filter = "alpha(opacity=" + (x*100) + ")";                    
            };
        })(i), i*appearTime);

    };
};