Scusa, il forum crea casini con le espressioni regolari. Come codice usa il contenuto di questo alert:

codice:
alert(unescape("function%20getIntro%28%29%20%7B%0A%09var%09sSrc%20%3D%20this.responseText%2C%20sTargetId%20%3D%20/*%20Qui%20va%20l%27id%20dell%27elemento%20contenente%20l%27intro%21%20*/%20%22intro%22%2C%0A%09%09rOpen%20%3D%20new%20RegExp%28%22%3C%5C%5Cs*%28%5B%5E%5C%5Cs%3E%5D+%29%5B%5E%3E%5D*%5C%5Cs+id%5C%5C%3D%5B%5C%22%5C%27%5D%22%20+%20sTargetId%20+%20%22%5B%5C%22%5C%27%5D%5B%5E%3E%5D*%3E%22%20%2C%22i%22%29%2C%0A%09%09aExec%20%3D%20rOpen.exec%28sSrc%29%2C%20sContent%20%3D%20%22%22%3B%0A%0A%09if%20%28aExec%29%20%7B%0A%09%09sContent%20%3D%20%28new%20RegExp%28%22%28%3F%3A%28%3F%3A.%28%3F%21%3C%5C%5Cs*%22%20+%20aExec%5B1%5D%20+%20%22%5B%5E%3E%5D*%5B%3E%5D%29%29*.%3F%3C%5C%5Cs*%22%20+%20aExec%5B1%5D%20+%20%22%5B%5E%3E%5D*%5B%3E%5D%28%3F%3A.%28%3F%21%3C%5C%5Cs*%5C/%5C%5Cs*%22%20+%20aExec%5B1%5D%20+%20%22%5C%5Cs*%3E%29%29*.%3F%3C%5C%5Cs*%5C/%5C%5Cs*%22%20+%20aExec%5B1%5D%20+%20%22%5C%5Cs*%3E%29*%28%3F%3A.%28%3F%21%3C%5C%5Cs*%5C/%5C%5Cs*%22%20+%20aExec%5B1%5D%20+%20%22%5C%5Cs*%3E%29%29*.%3F%22%2C%20%22i%22%29%29.exec%28sSrc.slice%28sSrc.indexOf%28aExec%5B0%5D%29%20+%20aExec%5B0%5D.length%29%29%20%7C%7C%20%22%22%3B%0A%09%7D%0A%0A%09/*%20sContent%20e%27%20la%20tua%20intro%20*/%0A%09alert%28sContent%29%0A%7D%0A%0Avar%20oReq%20%3D%20new%20XMLHttpRequest%28%29%3B%0AoReq.open%28%22GET%22%2C%20%22pagina1.html%22%2C%20true%29%3B%0AoReq.onload%20%3D%20getIntro%3B%0AoReq.send%28null%29%3B"));