function popup(url,width,height) {
    
    _popup(url,width,height,"scrollbars=yes,status=yes,resizable=yes");
    
}

function _popup(url,width,height,options) {
    
    var cX = 640;
    var cY = 480;

    if (window.screenX) {
        cX = window.screenX;
        cY = window.screenY;
    } else if (document.all) {
        cX = screen.availWidth; 
        cY = screen.availHeight; 
    }
    var X = (cX - width)/2;
    var Y = (cY - height)/2;
    
    window.open(url,"",options+",left="+X+",top="+Y+",screenX="+X+",screenY="+Y+",width="+width+",height="+height);
   
}


function mini_popup(url, width, height) {
    _popup(url,width,height,"status=yes,resizable=yes");

}