// JavaScript Document
function abrir(pagina,ancho,alto){
var left=parseInt((screen.availWidth/2) - (ancho/2));
var top=parseInt((screen.availHeight/2) - (alto/2));
var windowFeatures="toolbar=0, status=0, location=0, directories=0, menubar=0, scrollbars=1, resize=0, width=" + ancho + ", height=" + alto + ", top=" + top + ", left=" + left;
nueva_vent=open(pagina,'vent1',windowFeatures);
}