[xsl] How to sort this xml out

["Sri ni" <srini75 at hotmail dot com>]

All,

Please have a look on the following XML and XSL File.

I want to sort all the replies which previousID == a messageID and to group 
them under an tag called <content>

<?xml version="1.0" encoding="UTF-8"?>
<Main>
	<Message>
		<id>15</id>
		<parentID>0</parentID>
		<title>Title</title>
	</Message>
	<Message>
		<id>17</id>
		<parentID>0</parentID>
		<title>Second Title</title>
	</Message>
	<Reply>
		<id>16</id>
		<parentID>15</parentID>
		<title>first ReplyTitle</title>
	</Reply>

	<Reply>
		<id>18</id>
		<parentID>15</parentID>
		<title>Reply SecondTitle</title>
	</Reply>
</Main>


I tried grouping them with the "key" tag as described in this list, but of 
no success cany anyone please letme know how to do this??.

I want the output to be as follows:

<?xml version="1.0" encoding="UTF-8"?>
<Main>
	<Content>
		<id>15</id>
		<parentID>0</parentID>
		<title>Title</title>

		<id>16</id>
		<parentID>15</parentID>
		<title>first ReplyTitle</title>

		<id>18</id>
		<parentID>15</parentID>
		<title>Reply SecondTitle</title>
	</Content>

	<Message>
		<id>17</id>
		<parentID>0</parentID>
		<title>Second Title</title>
	</Message>
</Main>

can anyone help me??
Srini
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