jQuery change style of parent items if text value exists?

Hi Another quick jquery question. Should be a nice easy one for some of you.
I am trying to show a hidden div and it's contents if a hidden span has any text in it.
The text only appears if a placeholder has a value but remains hidden always.
If the div and contents is shown at the same time I want the content of another div to become hidden.
I've tried the below which doesn't trigger anything.

jquery

 $(document).ready(function(){
//  Hides image and shows video if text has a value
  		var BlogVid = $(".inner-banner div.youtube span.hide").text(); 
		if ($(BlogVid).val() != '') { 
		$(this).parents(".inner-banner div.youtube").css('display', 'block');
		$(this).parents(".inner-banner div.absolute img").css('display', 'none');
}   
});

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html

<section class="frame inner-banner"> <img alt="" src="/ImgLayout/frame.png" />
    <div class="absolute"><img src="{tag_MainImage585x327_value}" alt="{tag_name}" title="{tag_name}" /> </div>
    <div class="absolute youtube video" style="display: none;"><iframe width="602" height="336" src="http://www.youtube.com/embed/{tag_YouTubeID}?rel=0" frameborder="0"></iframe>
    <span class="hide" style="display: none;">{tag_YouTubeID}</span></div>
    </section>

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I would appreciate help,
regards
Lee