function addEvent(target, eve, func) {
        if(target.addEventListener)
        target.addEventListener(eve, func)
        else if(target.attachEvent)
        target.attachEvent("on" + eve, func)
        else
        eval(target + ".on" + eve + "=" + func + ";")
        }

        var play = document.getElementById("play");
        var stop = document.getElementById("stop");
        var frame1 = document.getElementById("frame1");
        var frame2 = document.getElementById("frame2");

        function changeFrames(location1, location2) {
            frame1.src = location1;
            frame2.src = location2;
        }

        addEvent(play, "click", function() {
        changeFrames("radio/playerwindow.html", "radio/play.html");
        });

        addEvent(stop, "click", function() {
        changeFrames("radio/stop.html", "radio/stop.html");
        });