XML to HTML

I'm converting XML to HTML and need help pulling a file name from an element
name through an attribute. My media is listed under a media items section
and then referenced in the text by an attribute. Is there any way of
referencing an element from an attribute? 
My XML example
Media Section:
<media_item identifier="medad59010005" category_type_code="3"
file_type_code="gif">
<media_name>Figure 2-1. </media_name>
<access_name>ad59010005.gif</access_name>
	</media_item>
Text section
		<instruction_content>
<media_ref media_alias="medad59010005"/>
		</instruction_content>
I need the <access_name> in place of the <media_ref> tag
Thanks
Greg



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