function OpenWindow(url, name, width, height) {

    leftVal = (screen.width - width) / 2;
    topVal = (screen.height - height) / 2;
    var load = window.open(url, name, 'scrollbars=no,menubar=no,height=' + height + ',width=' + width + ',top=' + topVal + ',left=' + leftVal + ',screenX=' + leftVal + ',screenY=' + topVal + ',resizable=yes,toolbar=no,location=no,status=no');
}

function sysreq() {
    leftVal = (screen.width - 400) / 2;
    topVal = (screen.height - 450) / 2;
    var load = window.open('requirements.aspx', 'SystemRequirements', 'scrollbars=no,menubar=no,height=450,width=400,top=' + topVal + ',left=' + leftVal + ',screenX=' + leftVal + ',screenY=' + topVal + ',resizable=yes,toolbar=no,location=no,status=no');
}

function acctypes() {
    leftVal = (screen.width - 575) / 2;
    topVal = (screen.height - 275) / 2;
    var load = window.open('account_types.aspx', 'AccountTypes', 'scrollbars=no,menubar=no,height=275,width=575,top=' + topVal + ',left=' + leftVal + ',screenX=' + leftVal + ',screenY=' + topVal + ',resizable=yes,toolbar=no,location=no,status=no');
}