function rtrim(argvalue) {
  while (1) {
    if (argvalue.substring(argvalue.length - 1, argvalue.length) != " ")
      break;
    argvalue = argvalue.substring(0, argvalue.length - 1);
  }
  return argvalue;
}

function ltrim(argvalue) {
  while (1) {
    if (argvalue.substring(0, 1) != " ")
      break;
    argvalue = argvalue.substring(1, argvalue.length);
  }
  return argvalue;
}

function trim(sString) {
	while (sString.substring(0,1) == ' ')
		sString = sString.substring(1, sString.length);
	while (sString.substring(sString.length-1, sString.length) == ' ')
		sString = sString.substring(0,sString.length-1);
	return sString;
}

function left(str, n){
	if (n <= 0)
		return "";
	else if (n > String(str).length)
		return str;
	else
	return String(str).substring(0,n);
}

function right(str, n){
	if (n <= 0)
		return "";
	else if (n > String(str).length)
		return str;
	else {
	var iLen = String(str).length;
	return String(str).substring(iLen, iLen - n);
	}
}

function isNumeric(strString) {

	var strValidChars = "0123456789.- ()";
	var strChar;
	var blnResult = true;

	if (strString.length == 0) return false;

	//  test strString consists of valid characters listed above
	for (i = 0; i < strString.length && blnResult == true; i++)	{
		strChar = strString.charAt(i);
		if (strValidChars.indexOf(strChar) == -1) {
			blnResult = false;
		}
	}
	return blnResult;
}

function isValidEmail(str) {
   return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
}

function controlExists(sFormName, sControlName) {

	for (var i=0; i<=document.forms.length-1; i++) {
		if (sFormName == document.forms[i].name) {
			for (var j=0; j<=document.forms[sFormName].elements.length-1; j++) {
				if (sControlName == document.forms[sFormName].elements[j].name)
					return true;
			}
		}
	}
	return false;
}