var win=null;

function openfenetre(mypage,myname,w,h,scroll,pos) {
    if (pos == "random") {
        LeftPosition = (screen.width) ? Math.floor(Math.random()*(screen.width-w)) : 100;
        TopPosition = (screen.height) ? Math.floor(Math.random()*((screen.height-h)-75)) : 100;
    }
    
    if (pos == "center") {
        LeftPosition = (screen.width) ? (screen.width-w)/2 : 100;
        TopPosition = (screen.height) ? (screen.height-h)/2 : 100;
    } else if ((pos != "center" && pos != "random") || pos == null) {
        LeftPosition = 0;
        TopPosition = 20
    }
    
    settings = "width=" + w + ",height=" + h + ",top=" + TopPosition + ",left=" + LeftPosition + ",scrollbars=" + scroll + ",location=no,directories=no,Status=no,menubar=no,toolbar=no,resizable=no";
    win = window.open(mypage,myname,settings);
}