>>Use Regex to remove the < script > ...... < / script >
>
>Thanks

Prototype.js has a String.prototype method for that:
yourHTML = yourHTML.stripScripts();

you can get the RegExp pattern from Prototype.js source code:

new RegExp('<script[^>]*>([\\S\\s]*?)<\/script>', 'img')

If you need to use $() in both Prototype.js and JQuery.js context, I have this function for you:

if (window.jQuery){ // $() compatible jQuery and Prototype

  true
  && $ // $() exists under firebug
  && $ === jQuery // $() === jQuery()
  && jQuery.noConflict(); // restaure Prototype.js!$()

  $_ = $; // sauve Prototype.js!$()

  $  = function(s){

      if (typeof s !== 'string') return s;

      if (s.replace(/[0-9a-z\-_:\.]/gi, '').length > 0) return jQuery(s); // contient d'autres caractères que ceux admis dans un ID HTML : forcément un sélecteur CSS
      /* ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".") */

      if (s.replace(/[a-z]/gi, '').length > 0) return $_(s); // contient des caractères non alphabétiques - forcément un id

      if (document.getElementsByTagName(s).length > 0) return jQuery(s); // tag

      return $_(s); // id avec seulement des caractères alphabétiques
  };

  Object.extend($, jQuery);
}