/*

	Javascript trim, ltrim, rtrim
	http://www.webtoolkit.info/

	Overview
	
	In programming, trim is a string manipulation function or algorithm. 
	The most popular variants of the trim function strip only the beginning 
	or end of the string. Typically named ltrim and rtrim respectively.
	
	Javascript trim implementation removes all leading and trailing 
	occurrences of a set of characters specified. If no characters are 
	specified it will trim whitespace characters from the beginning or end 
	or both of the string.
	
	Without the second parameter, they will trim these characters:
	
	    * " " (ASCII 32 (0x20)), an ordinary space.
	    * "\t" (ASCII 9 (0x09)), a tab.
	    * "\n" (ASCII 10 (0x0A)), a new line (line feed).
	    * "\r" (ASCII 13 (0x0D)), a carriage return.
	    * "\0" (ASCII 0 (0x00)), the NUL-byte.
	    * "\x0B" (ASCII 11 (0x0B)), a vertical tab.
	
*/

function trim(str, chars) {
	return ltrim(rtrim(str, chars), chars);
}
 
function ltrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("^[" + chars + "]+", "g"), "");
}
 
function rtrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("[" + chars + "]+$", "g"), "");
}