[xsl] Sorting times in xslt

Hello all, 

I'm curious what possible solutions you folks might have for sorting
times in XSLT.  

e.g.

I have the following xml:

<times>
	<time value="10:45"/>
	<time value="1:15"/>
	<time value="9:43"/>
	<time value="35:27"/>
	<time value="20:48"/>
</times>

and I wish to sort it by the value attribute, thus generating the 
following:

<times>
	<time value="1:15"/>
	<time value="9:43"/>
	<time value="10:45"/>
	<time value="20:48"/>
	<time value="35:27"/>
</times>

The problem is that due to the colons the value is evaluated as a 
string, not a number and thus produces:

<times>
	<time value="1:15"/>
	<time value="10:45"/>
	<time value="9:43"/>
	<time value="20:48"/>
	<time value="35:27"/>
</times>

Note the 10:45 is out of place.  Any ideas?

-matt

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