$(document).ready(function(){
  $("#tbPassword").focus();
  $('#bPassword').keydown(function(e){     
    if(e.keyCode == 13){ 
      $("#ctl00_ContentBody_btnAccept_linkButton")[0].click();
    }    
  });
  });

  document.getElementByIdx_x_x("tbPassword").onkeypress = function(event){
    var keynum;
    if(window.event) // IE
    {
     keynum = window.event.keyCode;
    }
    else if(event.which) // Netscape/Firefox/Opera
    {
     keynum = event.which;
    }
    
    if (keynum == 13)
      document.getElementByIdx_x_x('ctl00_ContentBody_btnAccept_linkButton').click();
  }

keynum = event.keyCode; // 字母d,keynum=100
    keychar = String.fromCharCode(keynum); // 将keynum转换成字符d

 keynum = event.which; // 字母d,keynum=100
    keychar = String.fromCharCode(keynum); // 将keynum转换成字符d