function CheckForm1()
{
	if(document.frmContact.txtName.value=="")
	{
		alert("Vui long cho chung toi biet ho ten cua ban.");
		document.frmContact.txtName.focus();
		return false;
		
		}
re = new RegExp("([A-Za-z0-9_.-]){2,}@([A-Za-z0-9_.-]){2,}\.([A-Za-z0-9_.-]){2,}")
if (document.frmContact.txtEmail.value.match(re) == null) 

	{
		alert("Vui long cho chung toi biet email cua ban.");
		document.frmContact.txtEmail.focus();
		return false;
		
	}

	if(document.frmContact.txtComment.value=="")
	{
		alert("Vui long gui cho chung toi noi dung/cau hoi cua ban.");
		document.frmContact.txtComment.focus();
		return false;
		
	}
	return true;
}

function CheckInputLogin(type) {
	if(document.frmLogin.masv.value==""){
		alert("Vui long nhap Ma SV.");
		document.frmLogin.masv.focus();
		return false;
	}
	loadPage('_loadmarkview.php?type='+type+'&masv='+document.frmLogin.masv.value,'div_loading_markview','DIV_MARKVIEW',0);
	return false;
}