JavaScript 一个日期选择函数

<ｓｅｌｅｃｔ id="Year" name="Year"><option value=""></option></ｓｅｌｅｃｔ>年
<ｓｅｌｅｃｔ id="Month" name="Month"></ｓｅｌｅｃｔ>月
<ｓｅｌｅｃｔ id="Day" name="Day"></ｓｅｌｅｃｔ>日<br />

<ｓｅｌｅｃｔ id="iYear" name="iYear"><option value=""></option></ｓｅｌｅｃｔ>年
<ｓｅｌｅｃｔ id="iMonth" name="iMonth"></ｓｅｌｅｃｔ>月<ｓｅｌｅｃｔ id="iDay" name="iDay"></ｓｅｌｅｃｔ>日

<script language="javascript">
<!--

//使用方法（对象区别字符串，默认选中日期，时间段），无顺序要求
PPDayｓｅｌｅｃｔ("");
PPDayｓｅｌｅｃｔ("i","1988-8-8","1988-1999");

function PPDayｓｅｌｅｃｔ(){var str=["","1940-2009","0-0-0"];for(var i=0;i<arguments.length;i++){if(arguments[i].split("-").length==1){str[0]=arguments[i]};if(arguments[i].split("-").length==2){str[1]=arguments[i]};if(arguments[i].split("-").length==3){str[2]=arguments[i]};}str[1]=str[1].split("-");if(str[2]=="0-0-0"){str[2]=str[1][0]+"-01-01";}str[2]=str[2].split("-");str[1][0]=parseInt(str[1][0]);str[1][1]=parseInt(str[1][1]);if(str[2][1].length<2){str[2][1]="0"+str[2][1];}if(str[2][2].length<2){str[2][2]="0"+str[2][2];}PPDayｓｅｌｅｃｔ1(str[0]+"Year",str[1][0],str[1][1]-str[1][0]+1);PPDayｓｅｌｅｃｔ1(str[0]+"Month",1,12);document.getElementById(str[0]+"Year").onchange=function(){PPDayｓｅｌｅｃｔ2(str[0]);};document.getElementById(str[0]+"Month").onchange=function(){PPDayｓｅｌｅｃｔ2(str[0]);};document.getElementById(str[0]+"Year").value=str[2][0];document.getElementById(str[0]+"Month").value=str[2][1];PPDayｓｅｌｅｃｔ2(str[0]);document.getElementById(str[0]+"Day").value=str[2][2];
}
function PPDayｓｅｌｅｃｔ1(ObjectName,StartNum,Length){var o=document.getElementById(ObjectName);o.options.length=Length;var ii;for(var i=0;i<Length;i++){ii=i+StartNum;if(ii<10){ii="0"+ii;}o.options[i]=new Option(ii,ii);}}

function PPDayｓｅｌｅｃｔ2(str){var DayLength=[31,28,31,30,31,30,31,31,30,31,30,31];var Year=document.getElementById(str+"Year").value;var Month=document.getElementById(str+"Month");if(Year%4==0){DayLength[1]=29;}else{DayLength[1]=28;}PPDayｓｅｌｅｃｔ1(str+"Day",1,DayLength[Month.ｓｅｌｅｃｔedIndex]);}　 
//-->
</script>