Hole In Speaker...How Do I fix it?

my son poked a hole in the television speaker on our old console television. i can't find any info oh where to buy a replacement and how to do it. we have to use this tv because of the way our home is set up, we can't have an entertainment center and this is our only option which suck since these tv's are older and not worth the cost of getting it fixed by a professional. i don't know if it makes a difference, but it is a zenith, about 15 years old...maybe older.