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);