window.onload=iniciar;

function iniciar(){
	topoAleatorio();
}

function topoAleatorio(){
	//acrescentar mais uma imagem ao array
	var imagensTopo=new Array();
	imagensTopo[0]="url('/imgs/cabecalho1.jpg')";
	imagensTopo[1]="url('/imgs/cabecalho2.jpg')";
	imagensTopo[2]="url('/imgs/cabecalho3.jpg')";
	imagensTopo[3]="url('/imgs/cabecalho4.jpg')";
	
	var num = Math.round((imagensTopo.length-1)*Math.random());
	
	var topo = document.getElementById("topImage");
	if (location.href.indexOf('vinhos.pl') > 0) {
		topo.style.background = '#fff';
	} else {
		topo.innerHTML = '<img src="/imgs/MascaraTopo.gif" width="618" height="297" />';
		topo.style.background = imagensTopo[num];
	}
}


function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}