How can I sell a company my idea for advertising their product?

Okay, I’m not usually one for having ridiculous, unrealistic business propositions (I am well on my way to a normal career, and I don’t need this), but I just happened to come up with an absolutely fantastic advertisement idea for a reputable product I use and love.

I’ve seen their commercials, and they don’t have anything going for them. Their product is spectacular, but hardly any women I know even use it because they’re not known enough. The company certainly has the money because they advertise on prime-time TV, but their commercials just aren’t catchy enough.

I have come up with a catchy jingle that is very specific to their product alone and would stick in the head of every woman during a certain time of need!!! If they changed their commercial to include my jingle, their sales would skyrocket.

I have no business knowledge whatsoever, and I don’t know how to go about selling my jingle idea to the company. How do I contact them and have them take my idea seriously without telling them what it is before they sign a contract that they will pay me if they use it?