Add text/link to price display

I've searched. If the answer is already on the board, please direct me to the proper post.



I am trying to figure out if there is an easy way to add text/link to the price everywhere the price is displayed (category, product page, blocks, recently viewed, etc).



What I want it to show is something along the following (it can even be a graphic image):



Default display of price (on product page):



List price: $627.00

$489.15

You save: $137.85 (22%)







What I want:



List price: $627.00

$489.15 [size=2][sup]*[/sup][/size][size=2][sup]Cash Price[/sup][/size]

You save: $137.85 (22%)







Where the Cash Price is a link to an explanation popup.



I can do the coding, I just need to figure out WHERE to do the coding so it will be displayed everywhere a price is displayed.



Ideally, I'd like to do the coding in a my_changes location so future upgrades won't write over it and I'll have to re-code it every time an update is made.



Can anybody give me help on figuring out where to code this in?



Thanks in advance for any help.

/skins/yourskin/customer/common_templates/price.tpl

Or

/skins/yourskin/customer/common_templates/product_data.tpl

You can find the proper hook to use for my_changes addon.