带开关的时钟

<script language="JavaScript">
var enabled=0;   
function TOfunc() {      
 TO = window.setTimeout( "TOfunc()", 1000);      
 var today = new Date();  
 document.clock.disp.value = today.toLocaleString();
    }
</script>
<form name="clock">
<input type="text" name="disp" value="" size=20
onFocus="this.blur()" ><br>
<input type="radio" name="rad" value="off"  onClick="if( enabled==1 )
    {
     document.clock.disp.value='';
     clearTimeout( TO );
     enabled = 0;
     }
   " checked>关<font color="#FFFF99"> </font>
<input type="radio" name="rad" value="on"  onClick="if( enabled == 0 )
 {
        var TO = setTimeout( 'TOfunc()', 1000 );
        enabled = 1;     }" >开<font color="#FFFF99"> </font>
</form>