function acMudaFotos(x,y) {
	var w = x;
	
	if (x < y)	x++;
	else x=1;

	setTimeout("acMudaFotos("+x+","+y+")",8000);

		img = document.getElementById('apoio'+x);
		img2 = document.getElementById('apoio'+w);
		
		img.style.filter  = "alpha(opacity=0)";
		img.style.opacity = "0.01"
		img.style.display = "block";
		img.style['-moz-opacity'] = "0.01";
		img.style.KhtmlOpacity = "0.01";
		
		opac = 0;
		var intervalo = setInterval(function() {
			if(opac < 100){
				opac+=3;
				img.style.filter  = "alpha(opacity="+opac+")";
				img.style.opacity = opac/100
				img.style['-moz-opacity'] = opac/100;
				img.style.KhtmlOpacity = opac/100;

				img2.style.filter  = "alpha(opacity="+(100-opac)+")";
				img2.style.opacity = (100-opac)/100
				img2.style['-moz-opacity'] = (100-opac)/100;
				img2.style.KhtmlOpacity = (100-opac)/100;
			} else { 
				clearInterval(intervalo);
				img2.style.display = 'none';
			}
		},30);
}