<button class="button" onclick="RandomID();" style="font-family: sans-serif;">RUN</button> <input class="input" type="text" id="id" name="id" size="3" readonly />
function RandomID() { var value; var rnd = Math.floor(Math.random() * 11); if (rnd === 7) value = "Wassup"; else if (rnd <= 5) value = "Hello"; else value = rnd; document.getElementById('id').value = value; }