Your code snippet is not working, here is the modified and working version of Javascript code
<SCRIPT LANGUAGE="JavaScript">
function clockTick()
{
currentTime = new Date();
document.clock_form.digitalclock.value = currentTime;
document.clock_form.digitalclock.blur();
setTimeout("clockTick()",1000);
}
clockTick();
//End of java script functions
</SCRIPT>
Thanks