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RTrim(string) : Returns a copy of a string without trailing spaces.
==================================================================
        function RTrim(str)
        /***
                PURPOSE: Remove trailing blanks from our string.
                IN: str - the string we want to RTrim

                RETVAL: An RTrimmed string!
        ***/
        {
                // We don't want to trip JUST spaces, but also tabs,
                // line feeds, etc.  Add anything else you want to
                // "trim" here in Whitespace
                var whitespace = new String(" \t\n\r");

                var s = new String(str);

                if (whitespace.indexOf(s.charAt(s.length-1)) != -1) {
                    // We have a string with trailing blank(s)...

                    var i = s.length - 1;       // Get length of string

                    // Iterate from the far right of string until we
                    // don't have any more whitespace...
                    while (i >= 0 && whitespace.indexOf(s.charAt(i)) != -1)
                        i--;


                    // Get the substring from the front of the string to
                    // where the last non-whitespace character is...
                    s = s.substring(0, i+1);
                }

                return s;
        }


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