calendar.currentDate--;
    if(calendar.currentDate==0){
     calendar.currentDate=12;
     calendar.currentDate[0]--;
    }
    calendar.show(calendar.target,calendar.currentDate[0]+"-"+calendar.currentDate+"-"+calendar.currentDate,calendar.source);
   }
   /*********** Calendar Today Button ***************/
   calendar.goToday = calendar.insertTbCell(trRow,2,"今天","center",3);
   calendar.goToday.title="选择今天";
   calendar.goToday.onclick=function(){
    calendar.sltDate=calendar.currentDate[0]+"-"+calendar.currentDate+"-"+calendar.currentDate;
    calendar.target.value=calendar.sltDate;
    calendar.hide();
    //calendar.show(calendar.target,calendar.today[0]+"-"+calendar.today+"-"+calendar.today,calendar.source);
   }
   /*********** Calendar NextMonth Button ***************/
   calendar.nextMonth = calendar.insertTbCell(trRow,3,">","center");
   calendar.nextMonth.title="下一";
   calendar.nextMonth.onmousedown=function(){
    calendar.currentDate++;
    if(calendar.currentDate==13){
     calendar.currentDate=1;
     calendar.currentDate[0]++;
    }
    calendar.show(calendar.target,calendar.currentDate[0]+"-"+calendar.currentDate+"-"+calendar.currentDate,calendar.source);
   }
   /*********** Calendar NextYear Button ***************/
   calendar.nextYear = calendar.insertTbCell(trRow,4,">>","center");
   calendar.nextYear.title="下一年";
   calendar.nextYear.onmousedown=function(){
    calendar.currentDate[0]++;
    calendar.show(calendar.target,calendar.currentDate[0]+"-"+calendar.currentDate+"-"+calendar.currentDate,calendar.source);