2.3l. Where is the silencer shaft mark?

Well, hopefully the valves were not damaged when the belt broke, If no valve damage was done, get the engine/crankshaft to top dead center, line up camshaft sprocket to timing mark and install belt around pulleys, gears, replace water pump if needed, tension belt if no automatic tensioner is used, try to start to see if it runs and hopefully it will. Might be time for an engine if valve damage was done.

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If the belt keeps jumping, I would say you have a badly worn sprocket or the belt tensioner needs checking, it may need a new tensioner or your procedure for tightening it needs to be checked.
If no mark for the idler, then just put it at the 4 o'clock position, as you are facing it.

Here is the trick. Align marks. Put the timing belt on the crank shaft pulley first, and after on the overhead cam pulley. Release tensioner and rotate the crank shaft till the timing belt makes two full circles. Try to align marks, you will be at least one tooth off. Align the crank shaft on the mark, and find out how many teeth you are off at the cam shaft pulley. Count the teeth. Remove the timing belt from cam shaft pulley only. Move cam shaft pulley in reverse according to the number of teeth you counted. Make sure the crank shaft pulley is on the mark. Mount the belt at cam shaft pulley.Rotate the belt two circles and check the marks. Repeate this procedure til after releasing the tensioner, and rotating the timing belt two full circles, the mars will be align.

its tricky enough if your not sure what your doing but ill run you through it. 1. remove top rocker cover and timing belt cover. 2 make up the position of the pully on the cam shaft at the top and the drive shaft at the bottom, this marks are you fail safe incase you cant time the engine. 3 remove the timing belt and pully tentioner, note if your going this far you are as well to replace the timing belt,tentioner and water pump. 4 On the cam shaft at the top if you force them to turn you will see a small indicator mark on the shaft this mark has to line up with the other indicator mark on the housing between the cam shaft and the cam shaft pully, once they line up your top end is timed, mark up the pully incase it moves. 5 on the drive shaft pully there is also markings that have to line up but you can also feel the position of the pully as you turn it, you will feel the piston been forced up and it is timed at top dead centre on cylinder one, which means the the piston has to be at the top just before the point of returning back down, using your feeling as a guide and the markings lined up you will have timing. also mark up this pully, your new marking should be very very close to the fail safe markings you put on at the start. when you have your marking replace the timing belt with the longest distance between pully contact going on first, try not disturb your timing or your hard work will have been for nothing, make sure the tentioner on the belt is tight but not to tight to the point where you ll stretch the belt or snap it, put everything back as you found it and crank the engine, job done, best of luck. hope this helps( rate me on my answer thanks )

The crankshaft pulley has a hole in it, just above the key. It should be straight up and lined up with the mark on the engine.
The cam pulley also has a hole, and it should be lined up with the little v in your camshaft cover. Put the belt on, line it up, and turn the engine over with a wrench or socket, 2 complete revolutions. Everything should be exactly the same place as when you lined it up. If not, you are out one cog, and will have to do it again.
Make sure the cam is on compression stroke when you line it up. Both valves on #1 cylinder should be fully up... in the closed position.

Complete instructions including pictures for the 22 http://www.subaruvanagon.com/tom/Timing%20Belt.htm

There's a circular stamp on the crankshaft gear teeth. If you drop your oilpan there's a corresponding mark on your oilpump.

I hope you've solved the problem by now, but there are alignment marks on the crank shaft (top pulley), idler (lower side), and cam shaft (smaller, bottom pulley) which should be aligned with stationary marks on the timing belt rear cover.

The belt has marks that align with the aforementioned marks (lines). The double marks on the belt align with the camshaft marks and the single marks with the others.

Loosen the tensioner clamp (nut) to allow the spring loaded tensioner to press on the belt and retighten the nut.

Rotate the crank shaft (clockwise, probably two revolutions) and make sure the pulley marks realign to the marks on the cover (they don't have to realign with the marks on the belt).

Rotate the crank shaft a full revolution once the belt is on and check that alignment is preserved.

Periodically loosen and retension the tensioner nut (access through a hole in the cover) to ensure that tension is maintained as the belt relaxes.