jqGrid突然停止工作

几年前我创建了一个php+smarty应用程序，其中我使用了jqGrid。

这些是版本号:jQuery 1.2.6, jqGrid 3.2.3

它当时工作得很好。

几天前当我检查它不工作。更奇怪的是，它在ie8上运行，在firefox和chrome浏览器上运行失败。

我检查了firefox的firebug控制台，我得到以下错误:

TypeError: jQuery(...).jqGrid is not a function

我无法理解为什么这个错误突然出现?

我包含了以下文件:

<link rel="stylesheet" type="text/css" media="screen" href="jqgrid/themes/style.css" />
     <link rel="stylesheet" type="text/css" media="screen" href="jqgrid/themes/basic/grid.css" />
    <script src="jqgrid/js/jquery.js" type="text/javascript"></script>
    <script src="jqgrid/js/jquery.jqGrid.js" type="text/javascript"></script>
    <script src="jqgrid/js/myjqGrid.js" type="text/javascript"></script>

jqGrid代码:

jQuery(document).ready(function(){
jQuery("#superadmin").jqGrid({  // Specify the ID of the Grid Table
    url:'jqgrid/superadminusers.php', // URL of PHP file
    datatype: "json", // Name of datatype
    colNames:['User Id','First Name','Last Name', 'Role', 'Contact','Edit','Delete','Status'], // Column Name in grid
    colModel:[ // Field name used in database
        {name:'username',index:'username', width:100},
        {name:'firstname',index:'firstname', width:120},
        {name:'lastname',index:'lastname', width:100},
        {name:'role',index:'role', width:100},
        {name:'phone',index:'phone', width:80},
        {name:'editrow',index:'editrow', width:50},
        {name:'deleterow',index:'deleterow', width:50},
        {name:'deletebook',index:'deletebook', width:100}
    ],
    pager: jQuery('#divPage'), // ID of Grid DIV
    rowNum:10, // Total no of rows that we want to show in grid at a time
    mtype: "POST", // method type
    height: 200, // height of grid
    width: 850, // width of grid
    multiselect: false, // set true the multiselect property
    rowList:[10,15,20], // set the number of list of rows
    imgpath: 'jqgrid/themes/sand/images', // path of images
    sortname: 'username', // column name by which grid will be sorted by default
    viewrecords: true,  // it will show the number of records below the grid
    sortorder: "asc",
  caption:'Users'
    });
});

我无法将其更新到最新的jqGrid版本，因为我必须手动更改所有文件中的代码。此外，我所使用的主题是不可用的jquery ui主题