function check_all_id()

	{

		if (document.getElementById("id"))

		{

			var len_id = id.length;

			if(len_id>1)

			{

				for (var i=0;i<len_id;i++)

				{

					id[i].checked = check_all.checked;

				}

			}

			else 

			{

					id.checked = check_all.checked;

			}

		}

	}

	

	function get_del_id(id_in)

	{

		var result = '';

		if (document.getElementById("id"))

		{

			if (id_in == "")

			{

				var len_id = id.length;

				

				if(len_id>1)

				{

					for (var i=0;i<len_id;i++)

					{

						if (id[i].checked == true)

						{

							result += id[i].value + ';';

						}

					}

				}

				else 

				{

						if (id.checked == true)

						{

							result += id.value + ';';

						}

				}

			}

			else

			{

							result = id_in + ';';

			}

		}

		return result;

	}

	

	function XoaMauTin(DelID)

	{

		kiemtra = confirm("Bạn có chắc chắn là muốn xóa ? Nên nhớ là không thể phục hồi");

		if (kiemtra == true)

		{

			document.del_frm.delID.value = DelID;

			document.del_frm.submit();

		}

	}

	

	var   form_below_req;

	var	form_below_which;

	

	

	function form_below_URL(url) {

	 if (window.XMLHttpRequest) { // Non-IE browsers

	  form_below_req = new XMLHttpRequest();

	  form_below_req.onreadystatechange = form_below_Change;

	  try {

		form_below_req.open("GET", url, true);

	  } catch (e) {

		alert(e);

	  }

	  form_below_req.send(null);

	} else if (window.ActiveXObject) { // IE

	  form_below_req = new ActiveXObject("Microsoft.XMLHTTP");

	  if (form_below_req) {

		form_below_req.onreadystatechange = form_below_Change;

		form_below_req.open("GET", url, true);

		form_below_req.send();

	  }

	}

	}

	

	function form_below_Change() {

	if (form_below_req.readyState < 4) {

		document.getElementById('form_below').innerHTML = "<div align=center><img src=\"images/loading.gif\"> Loading<br><br></div>";

	}

	if (form_below_req.readyState == 4) { // Complete

	  if (form_below_req.status == 200) { // OK response

		document.getElementById('form_below').innerHTML = form_below_req.responseText;

	  } else {

		alert("Problem: " + form_below_req.statusText);

	  }

	}

	}

	

	function check_contact()
	{
		if (document.frm_name.HoVaTen.value == '')
		{
				alert('Invalid form');
				document.frm_name.HoVaTen.focus();
				return false;
		}
		if (document.frm_name.DiaChi.value == '')
		{
				alert('Invalid form');
				document.frm_name.DiaChi.focus();
				return false;
		}		

		if (document.frm_name.DienThoai.value == '')
		{
				alert('Invalid form');
				document.frm_name.DienThoai.focus();
				return false;
		}

		if (document.frm_name.Email.value == '')
		{
				alert('Invalid form');
				document.frm_name.Email.focus();
				return false;
		}		

		if (document.frm_name.TieuDe.value == '')
		{
				alert('Invalid form');
				document.frm_name.TieuDe.focus();
				return false;
		}				

		if (document.frm_name.NoiDung.value == '')

		{
				alert('Invalid form');
				document.frm_name.NoiDung.focus();
				return false;
		}						
	}

	function check_ykien()
	{
		if (document.frm_name.HoVaTen.value == '')
		{
				alert('Invalid form');
				document.frm_name.HoVaTen.focus();
				return false;
		}
		if (document.frm_name.DiaChi.value == '')
		{
				alert('Invalid form');
				document.frm_name.DiaChi.focus();
				return false;
		}		

		if (document.frm_name.DienThoai.value == '')
		{
				alert('Invalid form');
				document.frm_name.DienThoai.focus();
				return false;
		}

		if (document.frm_name.Email.value == '')
		{
				alert('Invalid form');
				document.frm_name.Email.focus();
				return false;
		}		
			

		if (document.frm_name.NoiDung.value == '')

		{
				alert('Invalid form');
				document.frm_name.NoiDung.focus();
				return false;
		}						
	}

	function check_guichonguoithan()
	{
		if (document.frm_name.HoVaTen.value == '')
		{
				alert('Invalid form');
				document.frm_name.HoVaTen.focus();
				return false;
		}
		if (document.frm_name.Email.value == '')
		{
				alert('Invalid form');
				document.frm_name.Email.focus();
				return false;
		}		

		if (document.frm_name.HoVaTenNguoiNhan.value == '')
		{
				alert('Invalid form');
				document.frm_name.HoVaTenNguoiNhan.focus();
				return false;
		}

		if (document.frm_name.EmailNguoiNhan.value == '')
		{
				alert('Invalid form');
				document.frm_name.EmailNguoiNhan.focus();
				return false;
		}		

		if (document.frm_name.TieuDe.value == '')
		{
				alert('Invalid form');
				document.frm_name.TieuDe.focus();
				return false;
		}				

		if (document.frm_name.NoiDung.value == '')

		{
				alert('Invalid form');
				document.frm_name.NoiDung.focus();
				return false;
		}						
	}





function check_contact1()

	{

		if (document.frm_name.HoVaTen.value == '')

		{

				alert('Invalid form');

				document.frm_name.HoVaTen.focus();

				return false;

		}

		if (document.frm_name.Email.value == '')

		{

				alert('Invalid form');

				document.frm_name.Email.focus();

				return false;

		}		

		if (document.frm_name.TieuDe.value == '')

		{

				alert('Invalid form');

				document.frm_name.TieuDe.focus();

				return false;

		}				

		if (document.frm_name.NoiDung.value == '')

		{

				alert('Invalid form');

				document.frm_name.NoiDung.focus();

				return false;

		}						

	}