var heisei = new Date().getFullYear()-1988 ; //平成の最終年度

function changeYear(selno , target , s_kaisi) {

	var year_s , year_e ;

	if(s_kaisi != null && selno==1)
		year_s = s_kaisi ;
	else if(selno==0) 
		year_s = 0 ;
	else if(selno==1)
		year_s = 45 ;
	else
		year_s = 1 ;

	if(selno==0) {
		year_e = -1 ;
  } else if(selno==1) {
		year_e = 64 ;
	} else {
	/*
		if(heisei==-1) {
			alert("a") ;
			heisei = get_heisei() ;
			alert(heisei) ;
					
		}
		year_e = heisei ;
	*/
		year_e = heisei ;
  }

	var s = document.getElementById(target) ;
	s.options.length=year_e-year_s+2 ;


		s.options[0].text = "--" ;
		s.options[0].value = "";
	for(var y=year_s;y<=year_e;y++) {
		var v = "" + y ;
		if(v.length==1)
			v = "0" + v ;
		s.options[y-year_s+1].text = v ;
		s.options[y-year_s+1].value = v ;
	}
	s.selectedIndex = 0 ;
}