function $(id) {
	return document.getElementById(id);
}

var current = [];
function settabs(obj) {
	var num = obj.id.replace(/[\D]+/, '');
	var name = obj.id.replace(num, '');
	if(!current[name]) current[name] = '1';
	if(current[name] && current[name] != num) {
		$(name + current[name]).className = '';
		if($(name + 'con_' + current[name]))
			$(name + 'con_' + current[name]).style.display = 'none';
	}
	current[name] = num;
	$(name + current[name]).className = 'current';
	if($(name + 'con_' + current[name]))
		$(name + 'con_' + current[name]).style.display = '';
}

function CheckForm() {
  if($('GbUserName').value == '') {
    alert('请填写您的姓名！');
    $('GbUserName').focus();
    return false;
  }
  if($('GbUserEmail').value == '') {
    alert('请填写您的E-Mail地址！');
    $('GbUserEmail').focus();
    return false;
  }
  if ($('GbTitle').value == '') {
    alert ('请输入留言标题！');
    $('GbTitle').focus();
    return false;
  }
  if ($('GbTitle.value').length < 10 ) {
    alert ('请输入的留言标题少于10个汉字！');
    $('GbTitle').focus();
    return false;
  }
  if ($('GbContent').value == '') {
    alert ('请输入您的留言内容！');
    $('GbContent').focus();
    return false;
  }
}