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 power(x, n) {    
    var y = 1.0; // y = x^n
    var i;
    for (i = 0; i < n; i++) {
        y *= x;
    }
    return y;
}

function closeDialog() {
    window.close();
    return false;
}