// Both searches have to be in same form in ASP.net, so enter key fires first button.
// This fixes it for JavaScript users, others need to tab to second submit button.
$(function()
{
    function detectEnter(e)
    {
        // If enter pressed
        if (e.keyCode == 13)
        {
            // Don't fire default button
            e.preventDefault();
            
            // Click the sibling submit button instead
            $(':submit', $(e.target.parentNode)).click();
        }
    }
    
    // Wire up event
    $('.postcode').keydown(detectEnter);
})