function ftn_calendar(formname,field_name){
   var docFrm = document.all[formname]
   var ret = window.showModalDialog("include/cal_tab.html","","dialogWidth:290px;dialogHeight:250px;status:no;help:no;scrolling=no;scrollbars=no");
		if(ret!=null)
			docFrm.all[field_name].value =  ret

   return;
}
function ftn_calendar_compare(formname,fld_name,from_fld,to_fld)
{
   var docFrm = document.all[formname]
   var vFrom = docFrm.all[from_fld].value;
   var vTo = docFrm.all[to_fld].value;

   var ret = window.showModalDialog("include/cal_tab.html","","dialogWidth:290px;dialogHeight:250px;status:no;help:no;scrolling=no;scrollbars=no");

		if(ret != "none" && ret != "" && ret + "" != "undefined" )
		{
			if( fld_name == from_fld)
			{
				if (vTo != "" && vTo < ret)
				{
					alert("錯誤！");
					//docFrm.all[fld_name].value='';
					docFrm.all[fld_name].value=vTo;
				}
				else
				{
					if(ret!=null)
						docFrm.all[fld_name].value=ret
				}
			}
			else if (fld_name == to_fld)
			{
				if (vFrom != "" && vFrom > ret)
				{
					alert("錯誤！");
					//docFrm.all[fld_name].value='';
					docFrm.all[fld_name].value=vTo;
				}
				else
				{
					if(ret!=null)
						docFrm.all[fld_name].value=ret
				}
			}
		}

   return;
}