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J.J.Baxters Development Tips & Snippets
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 String Left and Right functions (JavaScript : 26-Nov-2006)

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){
    var iLen = String(str).length;
    if (n <= 0) return "";
    else if (n > iLen) return str;
    else return String(str).substring(iLen, iLen - n);
}
Ref Link: http://www.devx.com/tips/Tip/15222