var url=document.URL;
if(url==url.replace("vuosi=","")){
 <!-- alert("Pakollinen parametri \"vuosi\" puuttu!");-->

  
  

  var year=0;

  if (default_year!=undefined) {

      if (default_year!='') {
           year=default_year
      }
   }
  if (year==0) {
  var today = new Date();

           var nextyear=0;
                      <!--netscape,mozila-->
			if(today.getYear()<2000)
			 year=today.getYear()+1900;
                      <!--IE-->
			 else year=today.getYear();

      }
     
     
     window.open(url+"&vuosi="+year,"_self");
     


}