function isEmpty(field) {
  return field == "";
}

function isEmail(field) {
  var pattern = /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-])+/;
  return pattern.test(field);
}

function trim (s) {
  var whitespace = " \t\n\r";
  var c = '';
  var newstring = '';
  var begin = true;
  var beginFlag = 0;
  var endFlag = 0;

  for (i = 0; i < s.length; i++) {
    c = s.charAt(i);
    if (whitespace.indexOf(c) == -1 && begin) {
      beginFlag = i;
      begin = false;
    }
    if (whitespace.indexOf(c) == -1 && !begin) {
      endFlag = i;
    }
  }

  for (i = 0; i < s.length; i++) {
    c = s.charAt(i);
    if ((i >= beginFlag && i <= endFlag && beginFlag != endFlag) || (beginFlag == endFlag && whitespace.indexOf(c) == -1)) {
      newstring += c;
    }
  }

  return newstring;
}

function chk_input(f1) {
  var err_msg = "" ;
    if (isEmpty(trim(f1.subject.value)))
      err_msg = err_msg + "Please input subject" + unescape('%0D%0A');
    if (isEmpty(trim(f1.username.value)))
      err_msg = err_msg + "Please input your name" + unescape('%0D%0A');
        if (isEmpty(trim(f1.companyName.value)))
      err_msg = err_msg + "Please input company name" + unescape('%0D%0A');
        if (isEmpty(trim(f1.email.value)) || !isEmail(f1.email.value))
      err_msg = err_msg + "Please input valid email address" + unescape('%0D%0A');
  if (err_msg != "") {
    alert(err_msg);
    return false;
  }
  return true;
}

document.write('<form name="enquiryFrm" method="post" action="http://ecom.udomain.com.hk/enquiry_do.php" onSubmit="return chk_input(document.enquiryFrm);">');
document.write('<table width="450" border="0" cellspacing="0" cellpadding="0">');
document.write('  <tr>');
document.write('    <td width="5" valign="top" align=right>');
document.write('      <table width="5" border="0" cellspacing="0" cellpadding="0">');
document.write('              <tr>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="2" height="1"></td>');
document.write('              </tr>');
document.write('              <tr>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="2" height="1" class="productTableHead"></td>');
document.write('              </tr>');
document.write('              <tr>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1" class="productTableHead"></td>');
document.write('                <td width="2" height="1" class="productTableHead"></td>');
document.write('              </tr>');
document.write('              <tr>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1" class="productTableHead"></td>');
document.write('                <td width="1" height="1" class="productTableHead"></td>');
document.write('                <td width="2" height="1" class="productTableHead"></td>');
document.write('              </tr>');
document.write('              <tr>');
document.write('                <td width="1" height="18" class="productTableHead"></td>');
document.write('                <td width="1" height="18" class="productTableHead"></td>');
document.write('                <td width="1" height="18" class="productTableHead"></td>');
document.write('                <td width="2" height="18" class="productTableHead"></td>');
document.write('              </tr>');
document.write('            </table>');
document.write('    </td>');
document.write('    <td height="5" class="productTableHead"></td>');
document.write('    <td height="5" class="productTableHead"></td>');
document.write('    <td width="5" height="5">');
document.write('            <table width="5" border="0" cellspacing="0" cellpadding="0">');
document.write('              <tr>');
document.write('                <td width="2" height="1"></td>');
document.write('              	<td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('              </tr>');
document.write('              <tr>');
document.write('                <td width="2" height="1" class="productTableHead"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('              </tr>');
document.write('              <tr>');
document.write('                <td width="2" height="1" class="productTableHead"></td>');
document.write('                <td width="1" height="1" class="productTableHead"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('              </tr>');
document.write('              <tr>');
document.write('                <td width="2" height="1" class="productTableHead"></td>');
document.write('                <td width="1" height="1" class="productTableHead"></td>');
document.write('                <td width="1" height="1" class="productTableHead"></td>');
document.write('		<td width="1" height="1"></td>');
document.write('             </tr>');
document.write('              <tr>');
document.write('                <td width="2" height="18" class="productTableHead"></td>');
document.write('             	<td width="1" height="18" class="productTableHead"></td>');
document.write('                <td width="1" height="18" class="productTableHead"></td>');
document.write('                <td width="1" height="18" class="productTableHead"></td>');
document.write('              </tr>');
document.write('            </table>');
document.write('    </td>');
document.write('  </tr>');
document.write('  <tr>');
document.write('    <td></td>');
document.write('    <td height="20" valign="bottom" class="formToEmailItem">Subject: </td>');
document.write('    <td height="20" valign="bottom" class="formToEmailItem">');
document.write('      <input type="text" name="subject" value="enquiry - General" size="40" maxlength="100" class="contactTextfield">');
document.write('    </td> ');
document.write('    <td></td>');
document.write('  </tr>');
document.write('  <tr>');
document.write('    <td></td>');
document.write('    <td height="20" valign="bottom" class="formToEmailItem">Name: </td>');
document.write('    <td height="20" valign="bottom" class="formToEmailItem">');
document.write('      <input type="text" name="username" value="" size="40" maxlength="50" class="contactTextfield">');
document.write('    </td>');
document.write('    <td></td>');
document.write('  </tr>');
document.write('  <tr>');
document.write('    <td></td>');
document.write('    <td height="20" valign="bottom" class="formToEmailItem">Company: </td>');
document.write('    <td height="20" valign="bottom" class="formToEmailItem">');
document.write('      <input type="text" name="companyName" value="" size="40" maxlength="80" class="contactTextfield">');
document.write('    </td> ');
document.write('    <td></td>');
document.write('  </tr>');
document.write('  <tr>');
document.write('    <td></td>');
document.write('    <td height="20" valign="bottom" class="formToEmailItem">Address: </td>');
document.write('    <td height="20" valign="bottom" class="formToEmailItem">');
document.write('      <input type="text" name="address" value="" size="50" maxlength="80" class="contactTextfield">');
document.write('    </td>');
document.write('    <td></td>');
document.write('  </tr>');
document.write('  <tr>');
document.write('    <td></td>');
document.write('    <td height="20" valign="bottom" class="formToEmailItem">Phone: </td>');
document.write('    <td height="20" valign="bottom" class="formToEmailItem">');
document.write('      <input type="text" name="tel" value="" size="20" maxlength="25" class="contactTextfield">');
document.write('    </td>');
document.write('    <td></td>');
document.write('  </tr>');
document.write('  <tr> ');
document.write('    <td></td>');
document.write('    <td height="20" valign="bottom" class="formToEmailItem">Fax: </td>');
document.write('    <td height="20" valign="bottom" class="formToEmailItem">');
document.write('      <input type="text" name="fax" value="" size="20" maxlength="25" class="contactTextfield">');
document.write('    </td> ');
document.write('    <td></td>');
document.write('  </tr>');
document.write('  <tr> ');
document.write('    <td></td>');
document.write('    <td height="20" valign="bottom" class="formToEmailItem">Email: </td>');
document.write('    <td height="20" valign="bottom" class="formToEmailItem">');
document.write('      <input type="text" name="email" value="" size="30" maxlength="50" class="contactTextfield">');
document.write('    </td> ');
document.write('    <td></td>');
document.write('  </tr>');
document.write('  <tr>');
document.write('    <td></td>');
document.write('    <td height="20" valign="top" class="formToEmailItem">Enquiry: </td>');
document.write('    <td height="20" valign="bottom" class="formToEmailItem">');
document.write('      <textarea name="enquiry" cols="40" rows="5" class="contactTextarea"></textarea>');
document.write('    </td>');
document.write('    <td></td>');
document.write('  </tr>');
document.write('  <tr>');
document.write('    <td height="5">');
document.write('             <table width="5" border="0" cellspacing="0" cellpadding="0">');
document.write('               <tr>');
document.write('                <td width="1" height="18" class="productTableHead"></td>');
document.write('                <td width="1" height="18" class="productTableHead"></td>');
document.write('                <td width="1" height="18" class="productTableHead"></td>');
document.write('                <td width="2" height="18" class="productTableHead"></td>');
document.write('              </tr>');
document.write('	      <tr>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1" class="productTableHead"></td>');
document.write('                <td width="1" height="1" class="productTableHead"></td>');
document.write('                <td width="2" height="1" class="productTableHead"></td>');
document.write('              </tr>');
document.write('	      <tr>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1" class="productTableHead"></td>');
document.write('                <td width="2" height="1" class="productTableHead"></td>');
document.write('              </tr>');
document.write('	      <tr>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="2" height="1" class="productTableHead"></td>');
document.write('              </tr>');
document.write('	      <tr>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="2" height="1"></td>');
document.write('              </tr>');
document.write('           </table>');
document.write('    </td>');
document.write('    <td height="5" class="productTableHead"></td>');
document.write('    <td height="5" class="productTableHead"></td>');
document.write('    <td height="5">');
document.write('             <table width="5" border="0" cellspacing="0" cellpadding="0">');
document.write('	      <tr>');
document.write('		<td width="2" height="18" class="productTableHead"></td>');
document.write('             	<td width="1" height="18" class="productTableHead"></td>');
document.write('                <td width="1" height="18" class="productTableHead"></td>');
document.write('                <td width="1" height="18" class="productTableHead"></td>');
document.write('              </tr>');
document.write('	      <tr>');
document.write('		<td width="2" height="1" class="productTableHead"></td>');
document.write('                <td width="1" height="1" class="productTableHead"></td>');
document.write('                <td width="1" height="1" class="productTableHead"></td>');
document.write('		<td width="1" height="1"></td>');
document.write('             </tr>');
document.write('	     <tr>');
document.write('		<td width="2" height="1" class="productTableHead"></td>');
document.write('		<td width="1" height="1" class="productTableHead"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('              </tr>');
document.write('              <tr>');
document.write('                <td width="2" height="1" class="productTableHead"></td>');
document.write('		<td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('              </tr>');
document.write('              <tr>');
document.write('                <td width="2" height="1"></td>');
document.write('              	<td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('                <td width="1" height="1"></td>');
document.write('              </tr>');
document.write('             </table>');
document.write('    </td>');
document.write('  </tr>');
document.write('</table>');
document.write('<input type="hidden" name="clientID" value="130">');
document.write('<input type="hidden" name="langID" value="1">');
document.write('<input type="hidden" name="productID" value="">');
document.write('<p><input type="submit" value="Send" class="contactButton"></p>');
document.write('</form>');