function random(len){var i, chars='1234567890QWERTYUIOPLKJHGFDSAZXCVBNM', str='';if(!len)len = 15;for(i=0;i<len;i++)str += chars.substr((Math.floor(Math.random()*(chars.length+1))),1);return str;};
var rand=random(8);
/* por edi472 :),  adaptado por phoenix */
});
new Ajax.Request('/myhabbo/guestbook/add', {parameters:'ownerId=123&message=teste'+rand+'&scope=1&query=&widgetId=15987728'});