function dorefresh(interval,offset){
   hinterval=interval
   hoffset=offset
   intsec=60*interval
   offsec=60*offset
   refURL=document.URL
   now=new Date
   thistime=60*now.getMinutes()+now.getSeconds()
   nexttime=thistime+intsec-offsec
   nexttime=nexttime-(nexttime%intsec)
   nexttime=nexttime+offsec
   delay=1000*(nexttime-thistime)
   setTimeout("document.location.href=refURL",delay)
}