function checkField(field) {
  if (field.value == "") field.value = field.defaultValue;
}
function clearField(field) {
  if (field.value == field.defaultValue) field.value = "";
}
function checkChange()
{
  var frm = document.getElementById('change_form');
  if (frm.new_pass.value !== frm.confirm.value){
    alert('Wrong confirmation');
    return false;
  }
  else if (frm.old_pass.value.length == 0){
    alert('Fill field `Old password`');
    return false;
  }
  else if (frm.new_pass.value.length == 0){
    alert('Fill field `New password` and `Confirm`');
    return false;
  }
  return true;
}


function disableCatList()
{
  var search_type = document.getElementById('search_type');
  var cat_list = document.getElementById('cat_list');
  var cat_list_text = document.getElementById('cat_list_text');

  if (search_type.value != 1)
  {
    cat_list.style.visibility = 'hidden';
    cat_list_text.style.visibility = 'hidden';
  }
  else
  {
    cat_list.style.visibility = 'visible';
    cat_list_text.style.visibility = 'visible';
  }
}

function checkBuyForm()
{
  var form = document.getElementById('buy_form');
  if (!form.buy_image.checked && !form.buy_print.checked){
    alert('Order type do not checked...');
    return false;
  }
  if (form.buy_image.checked || form.buy_print.checked || form.buy_poster.checked || form.buy_calendar.checked){
      return true;
  }else  {
    alert('Check type of order');
    return false;
  }
}


function checkTopSearchForm()
{
  var form = document.getElementById('top_search');
  if (form.search_text.value.length > 0)
    return true;
  else
  {
    alert('Fill search field');
    return false;
  }
}









function checkBotstop(form)
{
	var reg = new RegExp('^[0-9]{4}$');
	if (!reg.test(form.botstop.value)){
		form.botstop.focus();
		alert('Fill field `Code`');
		return false;
	}else return true;
}


function checkEmail(form)
{
  var reg = new RegExp('^[^@]+@.*\\.[0-9A-Za-z^\\.]{2,5}$');
  if (!reg.test(form.email.value)){
    form.email.focus();
    alert('Fill field `E-mail`');
    return false;
  }else return true;
}

function Confirm(form)
{
  if (form.password.value != form.confirm.value){
    form.confirm.focus();
    alert('Wrong password confirm');
    return false;
  }else return true;
}


function checkName(form)
{
	var reg = new RegExp('^.+$');//[a-zA-Z0-9А-Я\sа-я_\\\\,]
	if (!reg.test(form.name.value)){
		form.name.focus();
		alert('Fill field `Name`');
		return false;
	}else return true;
}


function checkLength(obj, message)
{
  if (obj.value.length == 0){
    obj.focus();
    alert(message);
    return false;
  }else return true;
}

function checkKeyword(form)
{
  if (form.keyword.value.length == 0){
    form.keyword.focus();
    alert('Fill field `Search keyword`');
    return false;
  }else return true;
}

function checkLogin(form)
{
  if (form.login.value.length == 0){
    form.login.focus();
    alert('Fill field `Login`');
    return false;
  }else return true;
}



function checkPass(form)
{
  if (form.pass.value.length == 0){
    form.pass.focus();
    alert('Fill field `Password`');
    return false;
  }else return true;
}

function checkPassword(form)
{
  if (form.password.value.length == 0){
    form.password.focus();
    alert('Fill field `Password`');
    return false;
	}else return true;
}
function checkComment(form)
{
	if (form.comment.value.length == 0){
		form.comment.focus();
		alert('Fill field `Message`');
		return false;
	}else return true;
}