function go (url)
{
    if (url == '') return false;
    location.href=url;
    return true;
}

function pressButton(butId, press)
{
    var but_up = document.getElementById(butId+'_up');
    var but_down = document.getElementById(butId+'_down');
    if (press==true)
    {
        but_up.style.display = 'none';
        but_down.style.display = 'inline';
    }
    else
    {
        but_up.style.display = 'inline';
        but_down.style.display = 'none';
    }
}

function menuItemHighlight(itemId, item_style)
{
    var item = document.getElementById(itemId);
    item.style.background = item_style;
    var arrow = document.getElementById('arrow_'+itemId);
    if (arrow)
    {
        if (arrow.style.visibility == "hidden")
            arrow.style.visibility = "visible";
        else
            arrow.style.visibility = "hidden";
    }
}

function showSubmenuItems(smId, smIds)
{
    for (i=0; i<smIds.length; i++)
    {
        if (smId == smIds[i]) continue;
        var sm = document.getElementById(smIds[i]);
        sm.style.display = 'none';
    }
    if (smId != "")
    {
        var sm = document.getElementById(smId);
        sm.style.display = 'inline';
    }
}

function hideSubmenuItems(smId)
{
    var sm = document.getElementById(smId);
    sm.style.display = 'none';
}

function isValidEmail(email)
{
    var supported = 0;
    if (window.RegExp)
    {
        var tempStr = "a";
        var tempReg = new RegExp(tempStr);
        if (tempReg.test(tempStr))
            supported = 1;
    }
    if (!supported) 
        return (email.indexOf(".") > 1) && (email.indexOf("@") > 1);
    var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
    var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,6}|[0-9]{1,3})(\\]?)$");
    return (!r1.test(email) && r2.test(email));
}

function FreeTrialSubmit(formId, messages, button)
{
    var form = document.forms[formId];
    if (!form.cust_agree.checked)
    {
        alert(messages[0]);
        form.cust_agree.focus();
    }
    else if (form.cust_name.value=='' || form.cust_email.value=='')
    {
        alert(messages[1]);
        if (form.cust_name.value=='')
        {
            form.cust_name.focus();
        }
        else
        {
            form.cust_email.focus();
        }
    }
    else if(!isValidEmail(form.cust_email.value))
    {
        alert(messages[2]);
        form.cust_email.focus();
    }
    else
    {
        form.submit();
        button.onclick = "";
        button.disabled = true;
    }//form.submit();
}

function RegistrationSubmit(formId, messages)
{
    FreeTrialSubmit(formId, messages);
}