Graham admin_teGa Actually it is working fine
you just cannot "alert" html like that alert just outputs text
add a div with a id as a target and use innerHTML
<div id="abc"></div>
and then instead of alert use
document.getElementById("abc").innerHTML="<img src='img/07.gif' width='' height='' style=''><br/>Yeah!! Jawaban Kamu Benar!";
and
document.getElementById("abc").innerHTML="<img src='img/03.gif' width='' height='' style=''/><br/>Ohh!! Jawaban Kamu Salah!";
or just use text only in the alert