function validate(form)
{
	document.getElementById('signinButton').blur();
	document.getElementById('signoutButton').blur();
	var test = true;
	var patt = /^([\w]+)(.[\w]+)*@([\w]+)(.[\w]+)+.[\w]{2,4}$/;
     if(form.email.value == "")
     {
		document.getElementById("err_email").innerHTML = "Brak adresu email";
		test=false;
     }
     else if(!patt.test(form.email.value))
     {
		document.getElementById("err_email").innerHTML = "Niepoprawny adres email";
		test=false;
     }
     else
     {
     	document.getElementById("err_email").innerHTML = "";
     }
     return test;
}