<script type="text/javascript">

function setToRed ( )
{
   document.getElementById("colourButton").style.color = "#FF0000";
   setTimeout ( "setToBlack()", 2000 );
}

function setToBlack ( )
{
   document.getElementById("colourButton").style.color = "#000000";
}

</script>

<input type="button" name="clickMe" id="colourButton" value="Click me and wait!" onclick="setToRed()"/>