How To Bypass OnSubmit Form Validation In ASPX Page

i have a form on a particular ASPX page that has custom js validation. Also on this form is a navigation menu in the header.

The navigation menu items are built programatically and are initiated by __doPostBack calls which obviously submits the form.

The problem i am having is that the form itself has code something like the following

onsubmit='return validateForm()'

and if the form has not been filled out then the form cant submit. This in itself is not a problem unless a user goes to the form but decides to navigate away.

When this happens the validateForm function fails.

Does anyone have a workaround for this issue?

NB: On my nav links i have already set CausesValidation="False"

This is the markup:

<div id="divNavigate" class="absolute_topleft">
<asp:LinkButton ID="linkGoHome" runat="server" OnClick="linkGoHome_Click" CausesValidation="false" CssClass="xxx">text.</asp:LinkButton>
</div>

This is the handler:

protected void linkGoHome_Click(object sender, EventArgs e)
{
Response.Redirect("xxxxx");
}

This is the validation function:

[Code]....

And this is how its called:

<form id="formLogin" runat="server" onsubmit="return validateTextField(field1)">