function fillRobotCheck(formid) {
  var rbt, rbtobj, rbtarea;

  rbt = document.getElementById("rbt-"+formid);
  rbtobj = document.getElementById("robotsid-"+formid);
  if (rbt!=null && rbtobj!=null) {
    switch (rbt.value) {
      case "1": rbtobj.value = "january"; break;
  		case "2": rbtobj.value = "white"; break;
  		case "3": rbtobj.value = "night"; break;
  		case "4": rbtobj.value = "day"; break;
    }

		rbtarea = document.getElementById("robots-1-"+formid);
		if (rbtarea!=null) rbtarea.style.display = "none";
		rbtarea = document.getElementById("robots-2-"+formid);
		if (rbtarea!=null) rbtarea.style.display = "none";
  }
}

//input - zmena value
function changeI(input) {
	if (input.value == "search...") input.value = "";
}

function checkKomentarZpet(url) {
  var text;
  text = document.getElementById('msg_text');
  if (text.value=='' ||
    confirm('You have started to write a comment. Are you sure you want to abandon it and navigate back to list of comments?')) location.href=url;
}

function checkRegistrace(form) {
if (isEmpty(form.username.value)) {
	alert("Please input user name.");
	form.username.focus();
	return false
	}
if (isEmpty(form.password.value)) {
	alert("Please input password.");
	form.password.focus();
	return false
	}
if (isEmpty(form.passwordconfirm.value)) {
	alert("Please input the password again to check.");
	form.passwordconfirm.focus();
	return false
	}
if (form.passwordconfirm.value != form.password.value) {
	alert("Please check the correctness of the password input. Input it again carefully.");
	form.passwordconfirm.focus();
	return false
	}
if (isEmpty(form.firstname.value)) {
	alert("Please input first name.");
	form.firstname.focus();
	return false
	}
if (isEmpty(form.lastname.value)) {
	alert("Please input last name.");
	form.lastname.focus();
	return false
	}
if (isEmpty(form.email.value)) {
	alert("Please input e-mail.");
	form.email.focus();
	return false
	}
else if (!isEmail(form.email.value)) {
	alert("Please check the e-mail.");
	form.email.focus();
	return false
	}
else return true;

}

function checkEditace(form) {
if (isEmpty(form.firstname.value)) {
	alert("Please input first name.");
	form.firstname.focus();
	return false
	}
if (isEmpty(form.lastname.value)) {
	alert("Please input last name.");
	form.lastname.focus();
	return false
	}
if (isEmpty(form.email.value)) {
	alert("Please input e-mail.");
	form.email.focus();
	return false
	}
else if (!isEmail(form.email.value)) {
	alert("Please check the e-mail.");
	form.email.focus();
	return false
	}
else return true;

}

function zmenaHesla(form) {
if (isEmpty(form.oldpassword.value)) {
	alert("Please, insert your old password.");
	form.oldpassword.focus();
	return false
	}
if (isEmpty(form.newpassword.value)) {
	alert("Please, insert your new password.");
	form.newpassword.focus();
	return false
	}
if (isEmpty(form.newpasswordconfirm.value)) {
	alert("Please, insert your new password for confirmation.");
	form.newpasswordconfirm.focus();
	return false
	}
if (form.newpasswordconfirm.value != form.newpassword.value) {
	alert("Please, check insert again your password. Password for verification is different.");
	form.newpassword.focus();
	return false
	}
else return true;

}

function checkLogin(form) {
if (isEmpty(form.username.value)) {
	alert("Please, insert your login name.");
	form.username.focus();
	return false
	}
if (isEmpty(form.password.value)) {
	alert("Please, insert your password.");
	form.password.focus();
	return false
	}
else return true;

}

function checkZapomemuteHeslo(form) {
if (isEmpty(form.email.value)) {
	alert("Please input e-mail.");
	form.email.focus();
	return false
	}
else if (!isEmail(form.email.value)) {
	alert("Please check the e-mail.");
	form.email.focus();
	return false
	}
else return true;

}