function narrow(pageall, pagesel){
var selform = document.forms['press'];
var pressyear = selform.years.options[selform.years.selectedIndex].value;
var choice = "";
var page = "";
for (i=0; i<selform.presstype.length; i++ ){
   if( selform.presstype[i].checked ) {
      if( pressyear=="" ){
            choice = ""
            page = pageall;
      }else{
            choice = pressyear + "\\\\" + selform.presstype[i].value;
            page = pagesel;
      }
      if( (selform.presstype[1].checked & selform.presstype[2].checked) | selform.presstype[0].checked ) {
            choice = pressyear;
            page = pageall;
      }
      if( selform.presstype[0].checked ) break;
   }
}
var tmp = new String(window.location);
var opt = tmp.indexOf("&opt");
if( opt>0 ){
   tmp = tmp.substring(0, opt);
}else{
   var hash = tmp.indexOf("#");
   if( hash>0 ){
       //alert(hash + " - " + tmp.length);
       tmp = tmp.substring(0, hash);
   }
}
window.location = page + "?open&opt="+choice;
}