<html>
<body>
<input type="text" id="clock" size="35" />
<script type="text/javascript">
var int = 0;
function test(time){
int=window.setInterval("clock()",time);
};
function clock(){
var t=new Date();
document.getElementById("clock").value=t;
};
</script>
</form>
<button οnclick="window.clearInterval(int)">
Stop interval</button>
<button οnclick="test(50);">
start interval</button>
</body>
</html>
