<script>
function check_form() {
  var error_message = "<?php echo JS_ERROR; ?>";
  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 + "* <?php echo ERROR_AT_LEAST_ONE_INPUT; ?>\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 + "* <?php echo ERROR_INVALID_FROM_DATE; ?>\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 + "* <?php echo ERROR_INVALID_TO_DATE; ?>\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 + "* <?php echo ERROR_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 + "* <?php echo ERROR_PRICE_FROM_MUST_BE_NUM; ?>\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 + "* <?php echo ERROR_PRICE_TO_MUST_BE_NUM; ?>\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 + "* <?php echo ERROR_PRICE_TO_LESS_THAN_PRICE_FROM; ?>\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')
}

</script>
