function CheckForm(form)
{	var chyba=true;
	if (form.user_login.value=='') { form.user_login.style.background="#FF9999"; chyba=false; }
		else form.user_login.style.background="";
	if (form.user_password.value=='') { form.user_password.style.background="#FF9999"; chyba=false; }
		else form.user_password.style.background="";
	return chyba;
}