function abre_janela(url, Largura, Altura, Vscrool, Modal){
	
	if (Modal == true){
		window.showModalDialog(url,"Janela","dialogHeight: "+Altura+"px; dialogWidth: "+Largura+"px; edge: Raised; center: Yes; help: Yes; resizable: Yes; status: Yes;");		

	} else {
		var wX = (screen.width - Largura) / 2;
		var wY = (screen.height - Altura) / 2;
		window.open (url, "sJanela", "resize=1,scrollbars="+Vscrool+",menu=0,location=0,toolbar=0,copyhistory=0,status=1, width="+Largura+"px height="+Altura+"px" +" top="+ wY +" left="+ wX);
		
	}
}