Avoiding Enter button to do Postback on Button

Hi, I have a page, which has 3 DropDownLists and a button to forward.

The dropdownlists have dependent data, meaning by this that you only select data from the second when you select data on the first, and you only select data from the third when you select data from the second.

While I'm selecting data on the DropDownLists, if I press Enter key, the button Forward is pressed. Is there any option or solution to avoid this, other than developing a custom method in javascript to read the keycode of Enter key on the form and avoid its "pressing" on keyboard?

Thank you, best regards. ...