function stringTrim(targetString) {  var iBegin = 0;  var iEnd   = 0;  for (iBegin = 0; iBegin < targetString.length; iBegin++) {    if (targetString.charAt(iBegin) != " ") {       for (iEnd = targetString.length - 1; iEnd > iBegin; iEnd--) {         if (targetString.charAt(iEnd) != " ") {           break;         }       }       break;    }  }  if (iBegin > iEnd) {    iBegin = iEnd;  }  if (targetString.length > 0 && targetString.charAt(iEnd) != " ") {    iEnd++;  }  return targetString.substring(iBegin, iEnd);}function fieldTrim(objForm,fd) {  var trimmedString = stringTrim(objForm.elements[fd].value);  objForm.elements[fd].value = trimmedString;}function validateASCIIData(targetString) {  var iIndex;  for (iIndex = 0; iIndex < targetString.length; iIndex++) {    if ((targetString.charAt(iIndex) < " ") || (targetString.charAt(iIndex) > "~")) {      return false; }  }  return true;}function validateAlphaNumericData(targetString) {  var iIndex;  var cLetter;  var isOK;  for (iIndex=0; iIndex < targetString.length; iIndex++) { cLetter = targetString.charAt(iIndex);    if (!(cLetter >= "A" && cLetter <= "Z" ||          cLetter >= "a" && cLetter <= "z" ||          cLetter >= "0" && cLetter <= "9")) {return false; }  }  return true;}function validateEMail(objForm,fieldNameString) {  var eMailString = objForm.elements[fieldNameString].value;    if (!validateASCIIData(eMailString)) {    alert("Caracter inv&aacute;lido en la direcci&oacute;n de email.");    return false;  }  var invalidCharsString = "\"|&;<>!*\'\\";  for (var iIndex = 0; iIndex < invalidCharsString.length; iIndex++) {    if (eMailString.indexOf(invalidCharsString.charAt(iIndex)) != -1) {      alert("Caracter inv&aacute;lido en el email.\nLos siguientes caracteres no estan permitidos:\n" + invalidCharsString);  objForm.elements[fieldNameString].focus();      return false;    }  }  if (eMailString.indexOf("@")==-1) {    alert("La direcci&oacute;n de email debe contener el simbolo @");objForm.elements[fieldNameString].focus();    return false;  }  if (eMailString.indexOf(" ") != -1) {    alert("Los espacios no estan permitidos en la direcci&oacute;n de email.");objForm.elements[fieldNameString].focus();    return false;  }  if (window.RegExp) {    var reg1String = "(@.*@)|(\\.\\.)|(@\\.)|(\\.@)|(^\\.)";    var reg2String = "^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$";    var reg1RegExp = new RegExp (reg1String);    var reg2RegExp = new RegExp (reg2String);    if (reg1RegExp.test(eMailString) || !reg2RegExp.test(eMailString)) {      alert("La direcci&oacute;n de email contiene caracteres inv&aacute;lidos.");  objForm.elements[fieldNameString].focus();      return false;    }  }  return true;}function validateFieldNotEmpty(objForm,fieldNameString, errorString) {var fieldValueString;fieldValueString = objForm.elements[fieldNameString].value;fieldValueString = stringTrim(fieldValueString);if (fieldValueString == "") {alert(errorString);objForm.elements[fieldNameString].focus();return false;}else {return true;}}