SharePoint List Form Fields Read Only

Question

One ofthe list form field isnt becoming read only with IE but it is working in Chrome.

 

Here is the script we are using

 

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js" type="text/javascript"></script><script type="text/javascript">

$(document).ready(function() {

$(':checkbox[readonly]').click(function(){

return false;

});

$('nobr:contains("Comments and Directions")').closest('td').next().find("*").attr("readonly", "readonly"); // IE

$('nobr:contains("Comments and Directions")').closest('td').next().css("pointer-events" , "none"); // Chrome

$('nobr:contains("SIAI")').closest('td').next().find("*").attr("readonly", "readonly"); // IE

$('nobr:contains("SIAI")').closest('td').next().find("*").css("pointer-events" , "none");

});</script>​​​​​​​