**if (document.forms.length > 0) {**

    // Ensure we get the 'real' form
    for (var j=0; j<document.forms.length; j++)
    {
        if (document.forms[j].action != 'undefined' && document.forms[j].action != '')
        {
            frm = document.forms[j];
            break;
        }
    }

    // Find the first usable input field and set focus
    if (frm.elements.length > 0)
    {
        for (var i=0; i < frm.elements.length; i++)
        {
            elm = frm.elements[i];
            if ( canHaveFocus(elm) )
            {
                elm.focus();
                return;
            }
        }
    }