function sonda_popup() {
                                           var sonda_filled = getCookie('sonda_filled'); 
                                            if (sonda_filled == null) {
                                                    var sonda_seen = getCookie('sonda_seen'); 
                                                    if (sonda_seen == null){
                                                            if (navigator.userAgent.match(/MSIE/)){
                                                                    setTimeout("fb.loadAnchor('/floatbox/popup_sonda/sonda.html',rev='autoStart:true width:680 height:530')",1000);
                                                            } else {
                                                                    fb.loadAnchor('/floatbox/popup_sonda/sonda.html',rev='autoStart:true width:680 height:513');
                                                            }
                                                            
                                                            setCookie('sonda_seen',1,300);
                                               
                                                     } else if (sonda_seen < 3){ 
                                                            if (navigator.userAgent.match(/MSIE/)){
                                                                    setTimeout("fb.loadAnchor('/floatbox/popup_sonda/sonda.html',rev='autoStart:true width:680 height:530')",1000);
                                                            } else {
                                                                    fb.loadAnchor('/floatbox/popup_sonda/sonda.html',rev='autoStart:true width:680 height:513');
                                                            }
                                                            eraseCookie('sonda_seen');
                                                            setCookie('sonda_seen',++sonda_seen,300);
                                                     }
                                            }
                                    
                                }