function popup(sUrl, nombre, alto, ancho, scroll) { window.open(sUrl,nombre,"height="+alto+",width="+ancho+",toolbar=0,scrollbars="+scroll+",location=0,statusbar=0,menubar=0,resizable=0,top="+((screen.height/3)-(alto/2))+",left="+((screen.width/4)-(ancho))+""); return false; }