function changebg(element){
	if (element.className == "bg1"){
	        element.className = "bg2";
	}
	else {
	        element.className = "bg1";
	}
}

function AbrirVentana(URL,NOMBRE,ANCHO,ALTO){ 
	window.open(URL, NOMBRE, "status=no,toolbar=no,menubar=no,width="+ANCHO+",height="+ALTO+",scrollbars=no,resizable=no,location=no");
}