JQuery Sortable not working - Object Expected Error

I am a newbie to JQuery. I have added the JQuery JS Source with UI-Core,Widget,Mouse and UI-Sortable. I have taken the following source from internet.

    <meta charset="utf-8">
<title>jQuery UI Sortable - Portlets</title>
<link rel="stylesheet" href="../../themes/base/jquery.ui.all.css">
<script src="../../jquery-1.5.1.js"></script>
<script src="../../ui/jquery.ui.core.js"></script>
<script src="../../ui/jquery.ui.widget.js"></script>
<script src="../../ui/jquery.ui.mouse.js"></script>
<script src="../../ui/jquery.ui.sortable.js"></script>
<link rel="stylesheet" href="../demos.css">
<style>
.column { width: 170px; float: left; padding-bottom: 100px; }
.portlet { margin: 0 1em 1em 0; }
.portlet-header { margin: 0.3em; padding-bottom: 4px; padding-left: 0.2em; }
.portlet-header .ui-icon { float: right; }
.portlet-content { padding: 0.4em; }
.ui-sortable-placeholder { border: 1px dotted black; visibility: visible !important; height: 50px !important; }
.ui-sortable-placeholder * { visibility: hid开发者_运维百科den; }
</style>
<script>
$(function() {
    $( ".column" ).sortable({
        connectWith: ".column"
    });

    $( ".portlet" ).addClass( "ui-widget ui-widget-content ui-helper-clearfix ui-corner-all" )
        .find( ".portlet-header" )
            .addClass( "ui-widget-header ui-corner-all" )
            .prepend( "<span class='ui-icon ui-icon-minusthick'></span>")
            .end()
        .find( ".portlet-content" );

    $( ".portlet-header .ui-icon" ).click(function() {
        $( this ).toggleClass( "ui-icon-minusthick" ).toggleClass( "ui-icon-plusthick" );
        $( this ).parents( ".portlet:first" ).find( ".portlet-content" ).toggle();
    });

    $( ".column" ).disableSelection();
});
</script>

It fails in the lines $( ".column" ).sortable({....}) and $( ".column" ).disableSelection() as "Object Expected Error". The two other lines in between passes with no issues while I was debugging it.

Can anyone help me out in this issue?

---

I think you don't have an element with class="column", so the plugin throws an error because it doesn't find where to apply.

Hope this helps. Cheers