var wmonths = ["Jan","Feb","Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]; 

function do_opt(numopts,startnum,selnum)
{ if(!startnum && startnum != 0){startnum=1} 
  if(numopts == "mo"){ for (var xi=0; xi<wmonths.length; xi++) { document.write('<option value=' + (xi+1) + '>' + (wmonths[xi])); } }
  else { for (var xi=startnum; xi<=numopts; xi++) { sel=(selnum == xi)?" selected ":""; document.write('<option value=' + (xi) + sel + '>' + (xi) ); } }
}