[jQuery] Problem with XML :contains('texthere') Selector on IE

Hi,
xml:

<category>
                        <id>1</id>
                        <title>New Journey</title>
                        <sub_categories>
                                <sub_category>
                                        <id>1001</id>
                                        <title>Transport Bus Chatswood</title>
                                </sub_category>
                                <sub_category>
                                        <id>1002</id>
                                        <title>Transport Car Parking</title>
                                </sub_category>
                                <sub_category>
                                        <id>1003</id>
                                        <title>Transport $1000 subsidy</title>
                                </sub_category>
                        </sub_categories>
                </category>

This is the thing...

1. i have to fill a select optgroup with its options.
2. Filling the optgroup is okay, but with the options this works well
with firefox:

$("category[title:contains(\'" + $optionGroup + "\')]/...

where optionGroup is the optgroup label taken from the category/title
e.g. "new journey" text from the xml.

3. Look at this link: http://docs.jquery.com/Selectors

i used this $("li[a:contains('Register')]"); method.

4. It works well with firefox but doesn't work at all with IE.

So any idea how can i solve this problem?

Thanks.