<script type='text/javascript'>
function dcountup(startingdate, baseunit){
    this.currentTime=new Date()
    this.startingdate=new Date(startingdate)
    this.timesup=false
    this.baseunit=baseunit
    this.start()
}

dcountup.prototype.oncountup=function(){} //default action for "oncountup"

dcountup.prototype.start=function(){
    var thisobj=this
    this.currentTime.setSeconds(this.currentTime.getSeconds()+1)
    var timediff=(this.currentTime-this.startingdate)/1000 //difference btw target date and current date, in seconds
    var oneMinute=60 //minute unit in seconds
    var oneHour=60*60 //hour unit in seconds
    var oneDay=60*60*24 //day unit in seconds
    var dayfield=Math.floor(timediff/oneDay)
    var hourfield=Math.floor((timediff-dayfield*oneDay)/oneHour)
    var minutefield=Math.floor((timediff-dayfield*oneDay-hourfield*oneHour)/oneMinute)
    var secondfield=Math.floor((timediff-dayfield*oneDay-hourfield*oneHour-minutefield*oneMinute))
    if (this.baseunit=="hours"){ //if base unit is hours, set "hourfield" to be topmost level
        hourfield=dayfield*24+hourfield
        dayfield="n/a"
    }
    else if (this.baseunit=="minutes"){ //if base unit is minutes, set "minutefield" to be topmost level
        minutefield=dayfield*24*60+hourfield*60+minutefield
        dayfield=hourfield="n/a"
    }
    else if (this.baseunit=="seconds"){ //if base unit is seconds, set "secondfield" to be topmost level
        var secondfield=timediff
        dayfield=hourfield=minutefield="n/a"
    }
    var result={days: dayfield, hours:hourfield, minutes:minutefield, seconds:secondfield}
    this.oncountup(result)
    setTimeout(function(){thisobj.start()}, 1000) //update results every second
}
    </script>
<div id='cpcontainer'>
</div>
<script type='text/javascript'>
//SYNTAX: myvariable=new dcountup(past_date_and_time_string, "baseunit")
var princewedding=new dcountup("April 21, 2010", "days")

princewedding.oncountup=function(result){
    //result is an object containing the current count up date/time, updated every second
    //Available properties: result["days"], result["hours"], result["minutes"], and result["seconds"]
    var mycountainer=document.getElementById("cpcontainer")
    mycountainer.innerHTML=""+result['days']+" Gündür Sizlerleyiz..."
}
</script>