startday = new Date();
clockStart = startday.getTime();
function initStopwatch() 
{ 
 var myTime = new Date(); 
        var timeNow = myTime.getTime();  
        var timeDiff = timeNow - clockStart; 
        window.diffSecs = timeDiff/1000; 
        return(window.diffSecs); 
} 

function getSecs() 
{ 
        var mySecs = initStopwatch(); 
        var mySecs1 = ""+mySecs; 
        mySecs1= mySecs1.substring(0,mySecs1.indexOf(".")) + " sec."; 
        document.counter.timespent.value = mySecs1 
        window.setTimeout('getSecs()',1000); 
}