function trim(s)
{
   var retVal = "";
   var start = 0;
   var str= String(s);
	if( str== null || str.length == 0)
		return "";
   while ((start < str.length) && (str.charAt(start) == ' ')) {
   ++start;
   }
   var end = str.length;
   while ((end > 0) && (str.charAt(end - 1) == ' ')) 
	{
   	--end;
   }
   retVal = str.substring(start, end);
   return retVal;
}