function popup (URL){
window.open(URL,"ventana1","width=745, height=110, scrollbars=no, menubar=no, location=no, resizable=no")
}
document.write('<div align="left" id="contador"><A href="http://www.webservicio.com" onclick="popup(\'http://www.webservicio.com/publicidad/banner.php?dat=728x90\')"><IMG src="http://www.webservicio.com/servicios/contador/show_contador.php?id=1339&tama=" border="0"></A></div>')