function Is () // From developer.netscape.com
{
    var agt = navigator.userAgent.toLowerCase()
    this.major = parseInt(navigator.appVersion)
    this.minor = parseFloat(navigator.appVersion)
    this.nav = ((agt.indexOf('mozilla')!=-1) && ((agt.indexOf('spoofer')==-1) && (agt.indexOf('compatible') == -1)))
    this.ie = (agt.indexOf("msie") != -1)
    this.nav4up = this.nav && (this.major >= 4)
    this.ie4up = this.ie  && (this.major >= 4)
}

var is = new Is();

function openDialog(url) {
    if (is.ie4up) {
        var height = url == "calc-total.html" ? 385 : 375;
        window.showModalDialog(url, '', 'help:no;resizable:no;status:no;dialogWidth:380px;dialogHeight:' + height + 'px');
    }
    else {
        window.open(url, '', 'resizable=no,status=no,width=380,height=370,scrollbars=no');
    } 
}