It would go before this line:
if($store_img=="1") {

Digital Dynasty, if your running Store 3.0 i believe this hack will not work with it.

That made it show up on my store page...but now when I click the link its blank on the next page.

I am having the same problem as DigitalDynasty. I set it up and didnt have those 2 lines. I followed xxxsaint's advice on where to put it and it all does good but when i click on it to buy it, it takes me to a blank screen and it doesnt buy it. please help asap

If you get a vBulletin Message box with nothing in it, you need to add an:
$error_message ="Oops, you don't have enough $pointname to buy a lottery ticket.";
before:
eval("standarderror(\"".gettemplate('store_error') ."\");");
because the store error template will be blank otherwise. -- I basically re-wrote the lottery code bit because it wouldn't work. :3

Put it after it :p

does this hack work with the new Store hack 3?

Afraid not, However i believe Lesane will be porting it over soon :)

Yes, a new store version will arrive soon with the lottery integration.

This thread can be closed now... *points to a mod/admin*

As requested :)