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("Are you sure you want to delete ? Can't restore the file");
		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;
		}						
	}