function film(param){

	var format = 'mov';

    if (param == 'wmv') format = 'wmv'; 

	//erstellen des requests
     var 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!");

      //anfrage erstellen (GET, url ist localhost,
      //request ist asynchron      
      req.open("GET", 'filme/film_' + format + '.php', true);

    //Beim abschliessen des request wird diese Funktion ausgeführt
    req.onreadystatechange = function(){            
        switch(req.readyState) {
                case 4:
                if(req.status!=200) {
                    alert("Fehler:"+req.status); 
                }
				else
				{    
                    document.getElementById('film').innerHTML = req.responseText;
                }
                break;

                default:
                    return false;
                break;     
            }
        };

      req.setRequestHeader("Content-Type",
                          "application/x-www-form-urlencoded");
    req.send(null);
}