function checkContact() {	
	s = trimSpace($("#txtSender").val());	
	if(s.length>100 || s==""){
		alert('Muc "Nguoi gui" chua duoc nhap hoac lon hon 100 ky tu!');
		$("#txtSender").focus();
		return false;
	}
	s = trimSpace($("#txtSubject").val());	
	if(s.length>200 || s==""){
		alert('Muc "Tieu de" chua duoc nhap hoac lon hon 200 ky tu!');
		$("#txtSubject").focus();
		return false;
	}
	//-----------------------------------------
	s = trimSpace($("#txtAddress").val());	
	if(s!="" && s.length>100){
		alert('Muc "Dia chi" chua duoc nhap hoac lon hon 100 ky tu!');
		$("#txtAddress").focus();
		return false;
	}
	s = trimSpace($("#txtPhone").val());	
	if(s!="" && s.length>50){
		alert('Muc "Dien thoai" nho hon 50 ky tu!');
		$("#txtPhone").focus();
		return false;
	}
	//------------------------------------------------------
	s = trimSpace($("#txtContent").val());	
	if(s=="" || s.length>1000){
			alert('Muc "Noi dung" chua duoc nhap hoac vuot qua su cho phep!');
			$("#txtContent").focus();
			return false;
	}
	s = trimSpace($("#txtCode").val());	
	if(s=="" || s.length>1000){
		alert('Ma bao ve ban chua nhap!');
		$("#txtCode").focus();
		return false;
	}
	email = $("#txtFromMail").val();		
	if(email.length>0 && !isEmail(email)){			
		alert('Dia chi e-mail khong hop le!');
		return false;
	}		
	return true;
}

function sendContact(cat_id) {		
	if (checkContact()) {
		$.ajax({
		  type: "POST",
		  url: strPathTemplates + "modules/feedback/do.sql.php",
		  	data: {
				'act':			$('#act').val(),				  
				'txtSender': 	$('#txtSender').val(),
				'txtPhone': 	$('#txtPhone').val(),
				'txtAddress': 	$('#txtAddress').val(),  
				'txtFromMail': 	$('#txtFromMail').val(),
				'txtSubject': 	$('#txtSubject').val(),
				'txtContent': 	$('#txtContent').val(),	
				'lang':			lang,
				'code': 		$('#txtCode').val()					 
			},
		 	success: function(data) {		 					
				if(data.indexOf("ok")!=-1){
					$('#divForm').html('');	
					$('#divInfo').show();
				}else{
				$('#trerror').attr('style', 'display:');	
				$("#msgError").html("<font color=#bd0000>M&#227; b&#7843;o v&#7879; nh&#7853;p ch&#432;a &#273;&#250;ng</font>");
				}
		  	},
		  	error: function() {
				alert("Co van de khi xu ly. Vui long thu lai sau!");
			}
		});
	}
}