// funcion

function PopupCenter(url, title, w, h) {
    // Fixes dual-screen position                         Most browsers      Firefox
    var dualScreenLeft = window.screenLeft != undefined ? window.screenLeft : screen.left;
    var dualScreenTop = window.screenTop != undefined ? window.screenTop : screen.top;

    var width = window.innerWidth ? window.innerWidth : document.documentElement.clientWidth ? document.documentElement.clientWidth : screen.width;
    var height = window.innerHeight ? window.innerHeight : document.documentElement.clientHeight ? document.documentElement.clientHeight : screen.height;

    var left = ((width / 2) - (w / 2)) + dualScreenLeft;
    var top = ((height / 2) - (h / 2)) + dualScreenTop;
    var newWindow = window.open(url, title, 'scrollbars=yes, width=' + w + ', height=' + h + ', top=' + top + ', left=' + left);

    // Puts focus on the newWindow
    if (window.focus) {
        newWindow.focus();
    }


}






'llamado :

Case 12300 'Informe de Puertas / Permisos
                        objLink.ImageUrl = "../images/images_Adm/Informe_Puertas.gif"
                        objLink.Attributes.Add("onClick", "WinOpen( 1, 'Mantencion/Informe_Pfl_Pue.aspx', 'window2', 900,900,50,50)")
                        objCell.Controls.Add(objLink)
                        objCell.HorizontalAlign = HorizontalAlign.Center
                        objrow.Cells.Add(objCell)
                        objCell = New TableCell