window.onload = showDateTime;
function showDateTime() 
{
   setTimeout( "showDateTime()", 1000 );
   var daysOfWeek = new Array("Воскресенье", "Понедельник", "Вторник", "Среда", "Четверг", "Пятница", "Суббота");
   currDate = new Date();
   year = currDate.getFullYear();
   month = currDate.getMonth()+1;
   day = currDate.getDate();
   dayOfWeek = daysOfWeek[currDate.getDay()];
   hours   = currDate.getHours();
   minutes = currDate.getMinutes();
   seconds = currDate.getSeconds();
   if (month < 10)   month   = "0" + month;
   if (hours < 10)   hours   = "0" + hours;
   if (minutes < 10) minutes = "0" + minutes;
   if (seconds < 10) seconds = "0" + seconds;
   var resultString = day + "." + month + "." + year + " \\ " + dayOfWeek + " \\ " + hours+":"+minutes+":"+seconds;
   var Tag = document.getElementById("datetime");
   if (Tag!=null) Tag.innerHTML = resultString;
}