Hi when  use sortable() function of jquery on code where list comes on page load like on 
<apex:page standardController="Contact" extensions="extContactList">
    <link rel="stylesheet" href="//code.jquery.com/ui/1.10.4/themes/smoothness/jquery-ui.css"/>
    <script src="//code.jquery.com/jquery-1.10.2.js"></script>
    <script src="//code.jquery.com/ui/1.10.4/jquery-ui.js"></script>
    <link rel="stylesheet" href="/resources/demos/style.css"/>
   
     <style>
#sortable { list-style-type: none; margin: 0; padding: 0; width: 60%; }
#sortable li { margin: 0 3px 3px 3px; padding: 0.4em; padding-left: 1.5em; font-size: 1.4em; height: 18px; }
#sortable li span { position: absolute; margin-left: -1.3em; }
</style>

<script>
$(function() {
$( "#sortable" ).sortable();
$( "#sortable" ).disableSelection();
});
</script>

    <ul id="sortable" >
        <li class="ui-state-default"> First Name - Last Name - Id</li>
    <apex:repeat value="{!ContactList}" var="c">
        <li class="ui-state-default"> {!c.FirstName} - {!c.LastName} - {!c.Id} </li>
   
    </apex:repeat>
    </ul>
   
</apex:page>

It works perfectly but when i fetch the list after some action and rerender my list sortable() for drag and drop does not works as expected ?...please help me in this ASAP

while using onchatstarted() method of sforce.console.chat i am getting Uncaught TypeError: Cannot read property 'getFunction' of undefined error

and please tell me how the message is is sent(internally-coding way) from visitor's chat window to agent's chat window and vice versa....?

while using onchatstarted() method of sforce.console.chat i am getting Uncaught TypeError: Cannot read property 'getFunction' of undefined error