<style type="text/css">

        #container {}         #pagetitle {font-size: 20px; font-weight: bold; width: 100%; text-align: center; }    </style>

-------------------------------------------------------------------------------------------

     jQuery(function() {       var today = new Date();       var yesterday = today.setDate(today.getDate()-1);       jQuery("#day").datepicker({ dateFormat: "yy-mm-dd",maxDate: new Date(yesterday) });        var container=document.getElementById("container");       container.style.height=(document.body.clientHeight-20)+"px";      });

-------------------------------------------------------------------------------------------

function sendEmail(){

var url = "$rc.contextPath/sendEmailDayReport.do";

             var param = {"day":$("#day").val()};          $("#show").css("display","");        $("#bg").css("display","");           $("#data").load(url, param,function(res,status,xhr) {         $("#show").css("display","none");            $("#bg").css("display","none");        //("success", "notmodified", "error", "timeout" 或 "parsererror")            if(status == 'success'){             res = eval("(" + res + ")");          if(res=="1"){             alert("邮件发送成功！");          }else if(res=="0"){             alert("邮件发送失败！");          }else{             alert("系统发生异常！");          }      }else if(status =='error'){          alert("ajax操作失败!");      }         });

}

----------------------------------------------------------------------------------------------

 <div id="container" style="overflow-y:auto;padding-top:20px;">

    <div id="bg" style="display:none;width:100%; height:100%; background:#aaa; filter:alpha(Opacity=50); position:absolute; left:0; top:0;"></div>     <div id="show" style="display:none;padding:8px 0 8px 44px; margin-left:-80px; position:absolute; left:50%; top:344px; z-index:2; color:#000; background:url(images/loading.gif) no-repeat;">邮件发送中,请稍后...</div>     <div id="data" style="display:none"></div>