/***********************************************
* Dynamic CountUp script- © Dynamic Drive (http://www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit http://www.dynamicdrive.com/ for this script and 100s more.
***********************************************/

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
}