HTML – Колко време е изминало от дадена дата

Здравеите,
Това е скрипт които показва колко време е изминало от дадена дата

<script language="JavaScript1.2">

function setcountup(theyear,themonth,theday){
yr=theyear;mo=themonth;da=theday
}

//////////CONFIGURE THE countup SCRIPT HERE//////////////////

//STEP 1: Configure the date to count up from, in the format year, month, day:
//This date should be less than today
setcountup(2006,3,21)

//STEP 2: Configure text to be attached to count up
var displaymessage="have passed since the debut of our site!"

//STEP 3: Configure the below 5 variables to set the width, height, background color, and text style of the countup area
var countupwidth='95%'
var countupheight='20px' //applicable only in NS4
var countupbgcolor='lightyellow'
var opentags='<font face="Verdana"><small>'
var closetags='</small></font>'

//////////DO NOT EDIT PASS THIS LINE//////////////////

var montharray=new Array("Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec")
var crosscount=''

function start_countup(){
if (document.layers)
document.countupnsmain.visibility="show"
else if (document.all||document.getElementById)
crosscount=document.getElementById&&!document.all?document.getElementById("countupie") : countupie
countup()
}

if (document.all||document.getElementById)
document.write('<span id="countupie" style="width:'+countupwidth+'; background-color:'+countupbgcolor+'"></span>')

window.onload=start_countup


function countup(){
var today=new Date()
var todayy=today.getYear()
if (todayy < 1000)
todayy+=1900
var todaym=today.getMonth()
var todayd=today.getDate()
var todayh=today.getHours()
var todaymin=today.getMinutes()
var todaysec=today.getSeconds()
var todaystring=montharray[todaym]+" "+todayd+", "+todayy+" "+todayh+":"+todaymin+":"+todaysec
paststring=montharray[mo-1]+" "+da+", "+yr
dd=Date.parse(todaystring)-Date.parse(paststring)
dday=Math.floor(dd/(60*60*1000*24)*1)
dhour=Math.floor((dd%(60*60*1000*24))/(60*60*1000)*1)
dmin=Math.floor(((dd%(60*60*1000*24))%(60*60*1000))/(60*1000)*1)
dsec=Math.floor((((dd%(60*60*1000*24))%(60*60*1000))%(60*1000))/1000*1)

if (document.layers){
document.countupnsmain.document.countupnssub.document.write(opentags+dday+ " days, "+dhour+" hours, "+dmin+" minutes, and "+dsec+" seconds "+displaymessage+closetags)
document.countupnsmain.document.countupnssub.document.close()
}
else if (document.all||document.getElementById)
crosscount.innerHTML=opentags+dday+ " days, "+dhour+" hours, "+dmin+" minutes, and "+dsec+" seconds "+displaymessage+closetags

setTimeout("countup()",1000)
}
</script>

<ilayer id="countupnsmain" width=&{countupwidth}; height=&{countupheight}; bgColor=&{countupbgcolor}; visibility=hide><layer id="countupnssub" width=&{countupwidth}; height=&{countupheight}; left=0 top=0></layer></ilayer>