function abrirventana(args){
var largo = 420;
var ancho =  620;
var posx = (screen.width - ancho)/2;
var posy = (screen.height - largo)/2;
var attr = 'width='+ancho+',height='+largo+',location=0,menubar=0,scrollbars=1,directories=0,status=0,top='+posy+',left=' + posx ;
window.open(args,'finance',attr)
}