源码学习:一个简单的日历控件(2)

  /************** 设置各功能按钮的功能 *********************/
   /*********** Calendar About Button ***************/
   trRow = tbBoard.insertRow(0);
   calendar.calendarAbout=calendar.insertTbCell(trRow,0,"-","center");
   calendar.calendarAbout.onclick=function(){calendar.about();}
   /*********** Calendar Head ***************/
   tbCell=trRow.insertCell(1);
   tbCell.colSpan=5;
   tbCell.bgColor="#99CCFF";
   tbCell.align="center";
   tbCell.style.cssText = "cursor:default";
   calendar.head=tbCell;
   /*********** Calendar Close Button ***************/
   tbCell=trRow.insertCell(2);
   calendar.calendarClose = calendar.insertTbCell(trRow,2,"x","center");
   calendar.calendarClose.title="关闭";
   calendar.calendarClose.onclick=function(){calendar.hide();}

   /*********** Calendar PrevYear Button ***************/
   trRow = tbBoard.insertRow(1);
   calendar.prevYear = calendar.insertTbCell(trRow,0,"<<","center");
   calendar.prevYear.title="上一年";
   calendar.prevYear.onmousedown=function(){
    calendar.currentDate[0]--;
    calendar.show(calendar.target,calendar.currentDate[0]+"-"+calendar.currentDate[1]+"-"+calendar.currentDate[2],calendar.source);
   }
   /*********** Calendar PrevMonth Button ***************/
   calendar.prevMonth = calendar.insertTbCell(trRow,1,"<","center");
   calendar.prevMonth.title="上一月";
   calendar.prevMonth.onmousedown=function(){