function AbrirAyuda(url_page)
{
var ancho_screen =window.screen.availWidth
var alto_screen=window.screen.availHeight
    
var ancho=(ancho_screen / 1.50);
var alto =(alto_screen / 1.33);
    
var posx =(ancho_screen/2)-(ancho/2);
var posy =(alto_screen/2)-(alto/2);
    
var caracteristicas_normal='height=' + alto + ',width=' + ancho + ',top=' + posy + ',left=' + posx + ',scrollbars=Yes,titlebar=NO,location=No,menubar=NO,resizable=NO,minimizable=NO,status=Yes,directories=No,toolbar=No';      
window.open(url_page ,'',caracteristicas_normal); 
//window.showModalDialog(url_page , '','dialogHeight: ' + ((window.screen.availHeight)* 0.85) + 'px;dialogWidth:' + (window.screen.availWidth * 0.70) + 'px;edge:Raised; center: Yes; help: no;resizable:no;status:Yes;toolbar:1;');				
}