<div class="cronometro">
<div id="hms">00:00:00</div> 
<div class="boton start">
<input type="button" value=" star " onClick="star()"/>star</div> 
<div class="boton stop">
<input type="button" value=" stop " onClick="stop()"/>stop</div> 
<div class="boton reiniciar">
<input type="button" value=" reset " onClick="reset()"/></div> 
</div>
<hr> 