Changes data on the fly

Hello friends,
I'm sorry, I know the question has been asked several times .
Is it possible to change the value of the data on the fly ?
here is an example .

<quotes>
   <quote symbol="SUNW"  name="Sun Microsystems" />
   <quote symbol="AKAM"  name="Akamai Technologies" />
   <quote symbol="AOL"       name="America Online, Inc" />
   <quote symbol="YHOO"    name="Yahoo" />
</quotes>

I need to do something to change "AOL" by "AKAM"
The if I have the following 
<xsl:value-of select="count(quotes/quote[@symbol='AKAM'])" />
if would return 2 .

Any idea .

Thanx




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