<p id="a">     
ЗДЕСЬ ПИШЕМ ТЕКСТ</p>     
<script language="JavaScript" type="text/javascript">     
function change()     
{     
re="rgb("+Math.round(Math.random()*256)+","+Math.round(Math.random()*256)+","+Math.round(Math.random()*256)+")"     
a.sty le.color=   re;     
}     
setInterval(change,1000);     
</script>