function open_mapa(path,w,h){
	widthScreen = window.screen.availWidth;
	heightScreen = window.screen.availHeight;	
	sY = (heightScreen-h)/2;
	sX = (widthScreen-w)/2;	
	janela = window.open(path,'popup','width='+w+',height='+h,'screenX='+sX,'screenY='+sY);
	janela.moveTo(sX,sY);
	janela.focus();
}