function abre_pop(url,titulo,pop_size_w,pop_size_h){
	var posicaoX = screen.width - pop_size_w;
	var posicaoY = screen.height - pop_size_h;
	var legenda = parseInt(pop_size_h) + 30;
	if(posicaoX != 0){
		posicaoX = Math.round(posicaoX / 2);
		posicaoY = Math.round(posicaoY / 2);
	}
	pop = window.open(url,titulo,"toolbar=no,location=no,address=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=no,copyhistory=yes,maximized=yes,width="+pop_size_w+",height="+legenda+",left="+posicaoX+",top="+posicaoY);
	pop.focus();
}