Grouping problem

Hi,
How would I group following information based on time-zone and the day?
There are 40 prog elements, and the desired output should look like the
following table, and an excerpt of XML file is also part of this e-mail.

Thanks,



Time Zone (timezone[@value]
	Airing Day (airing[@day])    (Values are 1 to 7, starting with
Monday)                    
		Time (time[@value]) = Title (prog[@title])   



Example for the Eastern Time for Monday and Tuesday.
_________________

ET
	Monday
		1:00 am : Asthma
		6:30 am : Cancer
		9:00 am : Asthma
		2:30 pm : Cancer
		5:00 pm : Asthma
		10:30 pm : Cancer

	Tuesday
		6:30 am : Cancer
  		2:30 pm : Cancer
		10:30 pm : Cancer

---------------------------------	
    
---------------XML file-------
<main_schedule>
<schedule>
<prog ID="1" title="Asthma">
	<description><![CDATA[Asthma is a serious, allergy-related breathing
difficulty]]></description>
		<timezone value="ET">
			<airing day="1">
 				<time value="1:00am"/>
 				<time value="9:00am"/>
 				<time value="5:00pm"/>
			</airing>
			<airing day="2"/>
			<airing day="3"/>
			<airing day="4">
 				<time value="1:00am"/>
 				<time value="9:00am"/>
 				<time value="5:00pm"/>
			</airing>
			<airing day="5"/>
			<airing day="6"/>
			<airing day="7"/>
		</timezone>
		<timezone value="CT">
 			<airing day="1">
   				<time value="12:00am"/>
   				<time value="8:00am"/>
   				<time value="4:00pm"/>
 			</airing>
 			<airing day="2"/>
 			<airing day="3"/>
 			<airing day="4">
   				<time value="12:00am"/>
   				<time value="8:00am"/>
   				<time value="4:00pm"/>
 			</airing>
 			<airing day="5"/>
 			<airing day="6"/>
 			<airing day="7"/>
		</timezone>
		<timezone value="MT">
 			<airing day="1">
  				<time value="7:00am"/>
  				<time value="3:00pm"/>
 			</airing>
 			<airing day="2"/>
 			<airing day="3">
  				<time value="11:00pm"/>
			</airing>
 			<airing day="4">
  				<time value="7:00am"/>
  				<time value="3:00pm"/>
 			</airing>
 			<airing day="5"/>
 			<airing day="6"/>
 			<airing day="7">
   				<time value="11:00pm"/>
 			</airing>
		</timezone>
</prog>
<prog ID="2" title="Cancer">
	<description><![CDATA[Cancer is...]]></description>
		<timezone value="ET">
				<airing day="1">
					<time value="6:30am"/>
					<time value="2:30pm"/>
					<time value="10:30pm"/>
				</airing>
				<airing day="2">
					<time value="6:30am"/>
					<time value="2:30pm"/>
					<time value="10:30pm"/>
				</airing>
				<airing day="3">
					<time value="6:30am"/>
					<time value="2:30pm"/>
					<time value="10:30pm"/>
				</airing>
				<airing day="4">
					<time value="6:30am"/>
					<time value="2:30pm"/>
					<time value="10:30pm"/>
				</airing>
				<airing day="5">
					<time value="6:30am"/>
					<time value="2:30pm"/>
					<time value="10:30pm"/>
				</airing>
				<airing day="6">
					<time value="6:30am"/>
					<time value="2:30pm"/>
					<time value="10:30pm"/>
				</airing>
				<airing day="7">
					<time value="6:30am"/>
					<time value="2:30pm"/>
					<time value="10:30pm"/>
				</airing>
			</timezone>
			<timezone value="CT">
				<airing day="1">
					<time value="5:30am"/>
					<time value="1:30pm"/>
					<time value="9:30pm"/>
				</airing>
				<airing day="2">
					<time value="5:30am"/>
					<time value="1:30pm"/>
					<time value="9:30pm"/>
				</airing>
				<airing day="3">
					<time value="5:30am"/>
					<time value="1:30pm"/>
					<time value="9:30pm"/>
				</airing>
				<airing day="4">
					<time value="5:30am"/>
					<time value="1:30pm"/>
					<time value="9:30pm"/>
				</airing>
				<airing day="5">
					<time value="5:30am"/>
					<time value="1:30pm"/>
					<time value="9:30pm"/>
				</airing>
				<airing day="6">
					<time value="5:30am"/>
					<time value="1:30pm"/>
					<time value="9:30pm"/>
				</airing>
				<airing day="7">
					<time value="5:30am"/>
					<time value="1:30pm"/>
					<time value="9:30pm"/>
				</airing>
			</timezone>
			<timezone value="MT">
				<airing day="1">
					<time value="4:30am"/>
					<time value="12:30pm"/>
					<time value="8:30pm"/>
				</airing>
				<airing day="2">
					<time value="4:30am"/>
					<time value="12:30pm"/>
					<time value="8:30pm"/>
				</airing>
				<airing day="3">
					<time value="4:30am"/>
					<time value="12:30pm"/>
					<time value="8:30pm"/>
				</airing>
				<airing day="4">
					<time value="4:30am"/>
					<time value="12:30pm"/>
					<time value="8:30pm"/>
				</airing>
				<airing day="5">
					<time value="4:30am"/>
					<time value="12:30pm"/>
					<time value="8:30pm"/>
				</airing>
				<airing day="6">
					<time value="4:30am"/>
					<time value="12:30pm"/>
					<time value="8:30pm"/>
				</airing>
				<airing day="7">
					<time value="4:30am"/>
					<time value="12:30pm"/>
					<time value="8:30pm"/>
				</airing>
			</timezone>
</prog>
</schedule>
</main_schedule>

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