Prepend and Append not working on IE8 and IE7

[mikes000]

I am having issues using Prepend and Append on IE8 and IE7

Reviving the error:

SCRIPT600: Unknown runtime error 
jquery.dajax.core.js, line 37 character 56

on these lines:

case 'ap':
     jQuery.each($(elem.id),function(){ this[elem.prop] += elem.val; });
     break;

case 'pp':
     jQuery.each($(elem.id),function(){ this[elem.prop] = elem.val + this[elem.prop]; });

[jorgebastida]

I'm not a Windows user, if anybody can send any kind of patch, that would be excellent!