function contentChanger(){
    prefix = document.sendvcard.prefix.value;
    phone = document.sendvcard.phone.value;

    
                document.getElementById('smsloader').innerHTML = '<div><img src="layout/ajax-loader2.gif" style="margin-left:135px;margin-top:50px;"></div>'
                                                                    +'<div style="font-size:14px;margin-left:90px;margin-top:3px;">Einen Moment bitte...</div>';
                
                document.getElementById('smsloader').style.display='block';

    
                 //erstellen des requests
                req = null;

                try{
                    req = new XMLHttpRequest();
                }
                catch (ms){
                    try{
                        req = new ActiveXObject("Msxml2.XMLHTTP");
                    } 
                    catch (nonms){
                        try{
                            req = new ActiveXObject("Microsoft.XMLHTTP");
                        } 
                        catch (failed){
                            req = null;
                        }
                    }  
                }

                if (req == null)
                      alert("Error creating request object!");
                

                  req.open("GET", 'http://www.jan-wassmus.de/script/sendsms/sendvcard.php5?prefix='+prefix+'&phone='+phone, true);

                //Beim abschliessen des request wird diese Funktion ausgefŸhrt
                req.onreadystatechange = function(){            
                    switch(req.readyState) {
                            case 4:
                            if(req.status!=200) {
                                alert("Fehler:"+req.status); 
                            }else{
                                    document.getElementById('vcardbox').innerHTML = '<div>'+req.responseText+'</div>';
                                    document.getElementById('smsloader').style.display='none';
                            }
                            break;
                    
                            default:
                                return false;
                            break;     
                        }
                    }
		req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; txt/html; charset=utf-8");

                req.send(null);
            }