String.prototype.trim = function () {
 var sString = this;
 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;
}