var atual = 'pag1';
//setTimeout("document.getElementById('" + atual + "').style.display = 'block'",50);

function testa_navegador(){
var pode = false;
	if( (navigator.userAgent.indexOf('Firefox/2') > 1) || (navigator.userAgent.indexOf('Opera/9') > 1) || (navigator.userAgent.indexOf('Safari') > 1) || (navigator.userAgent.indexOf('Firefox/3') > 1) ){
	pode = true;
	}
return pode;
}

function muda_div(d){
	if(atual != d){
		document.getElementById(atual).style.zIndex = 1;
		document.getElementById(d).style.zIndex = 2;

		//if(testa_navegador()){
			//MM_effectAppearFade(atual, 500, 100, 0, false);
			//MM_effectAppearFade(d, 500, 0, 100, false);
		//}
		//else{
			document.getElementById(atual).style.display = 'none';
			document.getElementById(d).style.display = 'block';
		//}
		atual = d;
	}
}