function ventana(pagina, nombre, ancho, alto)
{
    top1 =  (screen.height / 2) - (alto/2);
	left1 = (screen.width / 2) - (ancho/2);
	var caracteristicas = 'directories=0,menubar=0,scrollbars=1,resizable=1,status=0,toolbar=0,width=' + ancho + ',height=' + alto + ',top=' + top1 + ',left=' + left1;
	window.open(pagina, nombre, caracteristicas);
}

function inicio()
{
	if (navigator.appName == "Microsoft Internet Explorer") {
		
		var arrElements = new Array(3);
		arrElements[0] = "object";
		arrElements[1] = "embed";
		arrElements[2] = "applet";
	
		for (n = 0; n < arrElements.length; n++) {
		
			replaceObj = document.getElementsByTagName(arrElements[n]);

			for (i = 0; i < replaceObj.length; i++ ) {
			
				parentObj = replaceObj[i].parentNode;
				
				newHTML = parentObj.innerHTML;
				
				parentObj.removeChild(replaceObj[i]);
				
				parentObj.innerHTML = newHTML;
			
			}
		}
	}
}