[xsl] Replacing an apostrophe in a string

I have to escape several characters, one of which is an apostrophe, in strings 
that I am writing out to a DOJO script. I've tried everything I can think of 
but can't get the apostrophe replace working.

Here's of few of the replaces I've tried: (note that all of the double and 
single quotes are the regular keyboard characters - outlook has altered them 
below)

<xsl:variable name="newString" select="replace(oldString, '(['])', 'XXX')"/>

<xsl:variable name="newString" select="replace(oldString, '&apos;', 'XXX')"/>

<xsl:variable name="newString" select="replace(oldString, '''', 'XXX')"/>

How can I get this to work?

For the examples 
oldString = that specifies condition's to be evaluated

newString should be = that specifies conditionXXXs to be evaluated

Thanks,
  Craig
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