function popUp(Url,NombreVentana,width,height,extras) {
	var largo = width;
	var altura = height;
	var adicionales= extras;
	var top = (screen.height-altura)/2;
	var izquierda = (screen.width-largo)/2; 
	nuevaVentana=window.open(''+ Url + '',''+ NombreVentana + '','width=' + largo + ',height=' + altura + ',top=' + top + ',left=' + izquierda + ',features=' + adicionales + '');
	nuevaVentana.focus();
}

function ancla(elemID) {
	var offsetTrail = document.getElementById(elemID);
	var offsetLeft = 0;
	var offsetTop = 0;
	while (offsetTrail) {
	offsetLeft += offsetTrail.offsetLeft;
	offsetTop += offsetTrail.offsetTop;
	offsetTrail = offsetTrail.offsetParent;
	}
	if (navigator.userAgent.indexOf("Mac") != -1 && typeof document.body.leftMargin != "undefined" && navigator.appName=="Microsoft Internet Explorer" ) {
	offsetLeft += parseInt(document.body.leftMargin);
	offsetTop += parseInt(document.body.topMargin);
	}
	
	
	var myFx = new Fx.Scroll($(document.body), {
    	wait: 0
	});
	myFx.start(offsetLeft, offsetTop);
	myFx.onComplete=function(){
		myFx.set(offsetLeft, offsetTop);
	}
}