Page Refresh On Form Submit?

I am running into a problem, that no one else in the world seems to have. When I make a form and submit the page is refreshed, or rather redirected to a state with the values filled after the ? [URL]

I have found solutions that have worked for other people, none of them work for me. I have tested my forms on multiple browsers on multiple systems and the problem persists.

Here is one example of my code where this happens.

<script type="text/javascript">
function checkCC(myForm)
{
var ccType;
var ccLength;

[Code].....

How do I get this to not happen? I've tried almost every fix I could find that worked for other people none have worked for me.