function check_email(email)
{

	if ((email.length<6)||(email.indexOf("@")<1)||(email.indexOf(".")<1))
	{

		return false;
	}
	if ((email.indexOf("@")==email.length-1)||(email.indexOf("@")!=email.lastIndexOf("@")))
	{

		return false;
	}
	if ((email.indexOf(".")==0)||(email.indexOf(".")==email.length))
	{

		return false;
	}

	if (email.indexOf(" ")>=0)
	{

		return false;
	}
return true;
}

//Called every time when form is perfomed
function checkForm(f) {
   var contend=  f.Melding.value;// contend mail
   var name=    f.Navn.value;   // name
   var tel=    f.Tlf.value;    // tel
   var email=    f.Epost.value; // email
   var captch=    f.Captcha.value;
   //-----
   if( contend == "" || name == "" || tel == "" || email == "" || captch == ""  )
   {
     alert("Feltene merket med \" * \" er ikke tom."); // khong duoc de trong "*"
     return;
   }
  if(!check_email(email))
   {
     alert("Epost er ikke gyldig.");
     return;
   }

  // neu co nhieu form thi :form:ten form
  //----- ma xac nhan  o cuoi cung , va su ly trong do de tranh truong hop chua kip gui tu server ve da chuyen sang lenh khac
   $.post("lib/captcha.php",{txtCaptcha:f.Captcha.value}, function(result){
      $("#imgCaptcha").attr("src", "lib/create_image.php?"+ Math.random());// tao anh ngau nhien lai
        if(result =="0")
        {
            alert("Captch ikke en kamp.");
        }
        else
           $("form").submit();

    });

  //-----


}