function trim(str) {
    var count = str.length;
    var len = count;                
    var st = 0;
                
    while ((st < len) && (str.charAt(st) <= ' ')) {
       st++;
    }
    while ((st < len) && (str.charAt(len - 1) <= ' ')) {
       len--;
    }                
    return ((st > 0) || (len < count)) ? str.substring(st, len) : str ;   
}