function imgchange(img_name, img_src)
   {
   document[img_name].src = img_src;
   }

function rowOverEffect(object) {
  if (object.className == 'moduleRow') object.className = 'moduleRowOver';
}

function rowOutEffect(object) {
  if (object.className == 'moduleRowOver') object.className = 'moduleRow';
}

function checkBox(object) {
  document.account_newsletter.elements[object].checked = !document.account_newsletter.elements[object].checked;
}

function check_form() {
  var error_message = "There is an error in the data you submitted";
  var error_found = false;
  var error_field;
  var keywords = document.advanced_search.keywords.value;
  var dfrom = document.advanced_search.dfrom.value;
  var dto = document.advanced_search.dto.value;
  var pfrom = document.advanced_search.pfrom.value;
  var pto = document.advanced_search.pto.value;
  var pfrom_float;
  var pto_float;

  if ( ((keywords == '') || (keywords.length < 1)) && ((dfrom == '') || (dfrom == '<?php echo DOB_FORMAT_STRING; ?>') || (dfrom.length < 1)) && ((dto == '') || (dto == '<?php echo DOB_FORMAT_STRING; ?>') || (dto.length < 1)) && ((pfrom == '') || (pfrom.length < 1)) && ((pto == '') || (pto.length < 1)) ) {
    error_message = error_message + "* Enter at least one term\n";
    error_field = document.advanced_search.keywords;
    error_found = true;
  }

  if ((dfrom.length > 0) && (dfrom != '<?php echo DOB_FORMAT_STRING; ?>')) {
    if (!IsValidDate(dfrom, '<?php echo DOB_FORMAT_STRING; ?>')) {
      error_message = error_message + "* Invalid from date (enter mm/dd/yyyy)\n";
      error_field = document.advanced_search.dfrom;
      error_found = true;
    }
  }

  if ((dto.length > 0) && (dto != '<?php echo DOB_FORMAT_STRING; ?>')) {
    if (!IsValidDate(dto, '<?php echo DOB_FORMAT_STRING; ?>')) {
      error_message = error_message + "* Invalid from date (enter mm/dd/yyyy)\n";
      error_field = document.advanced_search.dto;
      error_found = true;
    }
  }

  if ((dfrom.length > 0) && (dfrom != '<?php echo DOB_FORMAT_STRING; ?>') && (IsValidDate(dfrom, '<?php echo DOB_FORMAT_STRING; ?>')) && (dto.length > 0) && (dto != '<?php echo DOB_FORMAT_STRING; ?>') && (IsValidDate(dto, '<?php echo DOB_FORMAT_STRING; ?>'))) {
    if (!CheckDateRange(document.advanced_search.dfrom, document.advanced_search.dto)) {
      error_message = error_message + "* To date less than from date\n";
      error_field = document.advanced_search.dto;
      error_found = true;
    }
  }

  if (pfrom.length > 0) {
    pfrom_float = parseFloat(pfrom);
    if (isNaN(pfrom_float)) {
      error_message = error_message + "* Minimum price must be a number\n";
      error_field = document.advanced_search.pfrom;
      error_found = true;
    }
  } else {
    pfrom_float = 0;
  }

  if (pto.length > 0) {
    pto_float = parseFloat(pto);
    if (isNaN(pto_float)) {
      error_message = error_message + "* Maximum price must be a number\n";
      error_field = document.advanced_search.pto;
      error_found = true;
    }
  } else {
    pto_float = 0;
  }

  if ( (pfrom.length > 0) && (pto.length > 0) ) {
    if ( (!isNaN(pfrom_float)) && (!isNaN(pto_float)) && (pto_float < pfrom_float) ) {
      error_message = error_message + "* Maximum price less than minimum price\n";
      error_field = document.advanced_search.pto;
      error_found = true;
    }
  }

  if (error_found == true) {
    alert(error_message);
    error_field.focus();
    return false;
  } else {
    RemoveFormatString(document.advanced_search.dfrom, "<?php echo DOB_FORMAT_STRING; ?>");
    RemoveFormatString(document.advanced_search.dto, "<?php echo DOB_FORMAT_STRING; ?>");
    return true;
  }
}

function popupWindow(url) {
  window.open(url,'popupWindow','toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=no,width=450,height=280,screenX=150,screenY=150,top=150,left=150')
}

var selected;

function selectRowEffect(object, buttonSelect) {
  if (!selected) {
    if (document.getElementById) {
      selected = document.getElementById('defaultSelected');
    } else {
      selected = document.all['defaultSelected'];
    }
  }

  if (selected) selected.className = 'moduleRow';
  object.className = 'moduleRowSelected';
  selected = object;

// one button is not an array
  if (document.checkout_address.shipping[0]) {
    document.checkout_address.shipping[buttonSelect].checked=true;
  } else {
    document.checkout_address.shipping.checked=true;
  }
}

function check_form_optional(form_name) {
  var form = form_name;

  var firstname = form.elements['firstname'].value;
  var lastname = form.elements['lastname'].value;
  var street_address = form.elements['street_address'].value;

  if (firstname == '' && lastname == '' && street_address == '') {
    return true;
  } else {
    return check_form(form_name);
  }
}