Pressing enter in a multiline text area submits the form

[wll6568]

I have a text area and its multiline. It's working fine on IE, when I press the enter button and it will go to the next line below, but this is not the case in Firefox. When I pressed enter in it, it will submit the form. Anybody know how to fix that?

[wll6568]

This is the code:

<textarea name="_ctl0:ContentPlaceHolder1:cucCantact:txbMessage" rows="10" id="_ctl0_ContentPlaceHolder1_cucCantact_txbMessage" style="width:240px;">Testing</textarea>

[wll6568]

Actually, this is the code:

<asp:TextBox ID="txbMessage" runat="server" MaxLength="2000" width="240px" Rows="10" TextMode="MultiLine" />