function CheckDangNhap()
	{
		if(frmdangnhap.txtUser.value=="")
		{
		  alert('You must be input Username')
		  frmdangnhap.txtUser.focus()  
		  return false
		}
		if(frmdangnhap.txtPass.value=="")
		{
		  alert('You must be input password')
		  frmdangnhap.txtPass.focus()  
		  return false
		}
		 return true
	}
	function CheckTinRV()
	{
		if(frmTinhThanh.TieuDe.value=="")
		{
		  alert('Heading is not valid')
		  frmTinhThanh.TieuDe.focus()  
		  return false
		}
		if(frmTinhThanh.txtGia.value=="")
		{
		  alert('Pirce is not valid')
		  frmTinhThanh.txtGia.focus()  
		  return false
		}
		if(isNaN(frmTinhThanh.txtGia.value))
		{
		  alert('Pirce must be number')
		  frmTinhThanh.txtGia.focus()  
		  return false
		}
		if(frmTinhThanh.TinhThanh.value=="")
		{
		  alert('Place is not valid')
		  frmTinhThanh.TinhThanh.focus()  
		  return false
		}
		if(frmTinhThanh.MoTa.value=="")
		{
		  alert('Content is not valid')
		  frmTinhThanh.MoTa.focus()  
		  return false
		}
	}
function Kenh_HoiDoai(x)
{
	if (x.style.display=='block')
	{
	x.style.display='none';							
	}
	else 
	{
	x.style.display='block';							
	}
}
function Kenh_GiaVang(x)
{
	if (x.style.display=='block')
	{
	x.style.display='none';							
	}
	else 
	{
	x.style.display='block';							
	}
}
function Kenh_ChungKhoan(x)
{
	if (x.style.display=='block')
	{
	x.style.display='none';							
	}
	else 
	{
	x.style.display='block';							
	}
}
function Kenh_ThoiTiet(x)
{
	if (x.style.display=='block')
	{
	x.style.display='none';							
	}
	else 
	{
	x.style.display='block';							
	}
}
function Kenh_LichChieuPhim(x)
{
	if (x.style.display=='block')
	{
	x.style.display='none';							
	}
	else 
	{
	x.style.display='block';							
	}
}
function Kenh_LichDaBong(x)
{
	if (x.style.display=='block')
	{
	x.style.display='none';							
	}
	else 
	{
	x.style.display='block';							
	}
}