function docheck()
	{
		if(document.l_he.hoten.value=='')
		{
			alert('Please enter your name');
			document.l_he.hoten.focus();
			return false;
		}
if(document.l_he.diachi.value=='')
		{
			alert('Please enter your address');
			document.l_he.diachi.focus();
			return false;
		}
if(document.l_he.email.value=='')
		{
			alert('Please enter your email');
			document.l_he.email.focus();
			return false;
		}
		if (!checkemail(document.l_he.email.value))
		{
			alert("Please enter your email again ");
			document.l_he.email.focus();
			return false;
		}
		if(document.l_he.dienthoai.value=='')
		{
			alert('Please enter your phone number');
			document.l_he.dienthoai.focus();
			return false;
		}
		
		
		if(document.l_he.noidung.value=='')
		{
			alert('Please enter your content');
			document.l_he.noidung.focus();
			return false;
		}
		return true;
	}