No, that's all right. Incidentally, there are some concepts here that might help you with your other problem. Take a look at how $w(x)$ appears in the Sturm-Liouville operator, as well as how it shows up in the inner product w.r.t. which the Sturm-Liouville operator is symmetric.Sorry you took your time. I should perhaps do a bit more reasearch before asking here.