// Replace function.
   function replace(string,text,by) {
   var strLength = string.length, txtLength = text.length;
   if ((strLength == 0) || (txtLength == 0)) return string;
   var i = string.indexOf(text);
   if ((!i) && (text != string.substring(0,txtLength))) return string;
   if (i == -1) return string;
   var newstr = string.substring(0,i) + by;
   if (i+txtLength < strLength)
   newstr +=
   replace(string.substring(i+txtLength,strLength),text,by);
   return newstr;
   }