if(jQuery) (function($){
//定义键盘代码
var _numkeybordhtml = "<div id=\"numkeybord\">\n"
       + "<table id=\"main\"><tr>\n"
       + "<td colspan=\"2\" id=\"esc\">退出</td>\n"
       + "<td colspan=\"2\" id=\"back\">退格</td></tr>\n"
       + "<tr><td class=\"key\">9</td>\n"
       + "<td class=\"key\">8</td>\n"
       + "<td class=\"key\">7</td>\n"
       + "<td class=\"key\">6</td></tr>\n"
       + "<tr><td class=\"key\">5</td>\n"
       + "<td class=\"key\">4</td>\n"
       + "<td class=\"key\">3</td>\n"
       + "<td class=\"key\">2</td></tr>\n"
       + "<tr><td class=\"key\">1</td>\n"
       + "<td class=\"key\">0</td>\n"
       + "<td colspan=\"2\" id=\"enter\">确定</td></tr>\n"
       + "</table>\n"
       + "</div>\n"; 
//定义插件
jQuery.fn.numkeybord = function(_option){
   //键盘追加到网页中
   $(document.body).append(_numkeybordhtml);  
   var _obj = this;  
   jQuery.each(_obj,function(i,_o){
    $(_o).bind('click.show',function(){ _show(this); });
   });  
   $("#numkeybord td#esc,#numkeybord td#enter").bind('click.hide',function(){
    _hide();
   });  
   $("#numkeybord td.key").bind('click.returnkey',function(){
    var tmp    = $("#numkeybord").attr("target");
    var obj_tmp   = $("#"+tmp);   
    _returnkey(obj_tmp,$(this).text());   
    $(this).blur();
   });  
   $("#numkeybord td#back").bind('click.back',function(){
    var tmp    = $("#numkeybord").attr("target");
    var obj_tmp   = $("#"+tmp);   
    _back(obj_tmp);
   });  
   var _isover = false;
   var _isover2 = false;  
   $("#numkeybord").hover(function(){
    _isover = true;
   },
   function(){
    _isover = false;
   });
  
   $(_obj).hover(function(){
    _isover2 = true;
   },
   function(){
    _isover2 = false;
   });  
   $(document).click(function(){
    $("#debug").text(_isover + "|" + _isover2);
    if(_isover == false && _isover2 == false){
     $("#numkeybord").css({display:'none'});
    }
   });
   if(_option == null)
    return;
   else{   
    if(_option.enter == false)
     $("td#enter").unbind('click.hide').css({color:"#999999"});   
    if(_option.esc == false)
     $("td#esc").unbind('click.hide').css({color:"#999999"});   
    if(_option.back == false)
     $("td#back").unbind('click.back').css({color:"#999999"});
   }
} 
//键盘与元素绑定及显示
function _show(_input){
   var _offset    = $(_input).offset();
   var _left    = _offset.left+357;
   var _top    = _offset.top - $(_input).height() - ($.browser.msie ? 5 : 6);  
   $("#numkeybord").attr("target",_input.id).css({left:_left + "px",top:_top + "px",display:'block'});
   _focus(_input);
} 
//输入操作
function _returnkey(_input,_val){
   if($(_input).val().length >= $(_input).attr("maxlength")) return;
   var tmpval = $(_input).val() + _val;
   $(_input).val(tmpval);
   //$(_input).focus();  
   _focus(_input);
} 
//光标返回
function _focus(_input){
   //$(_input).focus();
   if($.browser.msie){
    var rng = $(_input)[0].createTextRange(); 
    rng.collapse(false);
    rng.select();
   }else{
    $(_input).focus();
   }
} 
//退格操作
function _back(_input){
   var _len = $(_input).val().length;
   var _tmp = $(_input).val();  
   $(_input).val(_tmp.substr(0,_len-1));  
   _focus(_input);
} 
//键盘关闭
function _hide(_input){
   var tmp    = $("#numkeybord").attr("target");
   var obj_tmp   = $("#"+tmp);
   $("#numkeybord").css({display:'none'});
   //$(obj_tmp).focus();
   _focus(obj_tmp);
} 
})(jQuery);