Prueba esto...
Código PHP:
<!--
var max = 10;
if(threads.length < max)
max = threads.length;
var titulo;
for(x = 0; x < max; x++)
{
if (threads[x].title.length > 23)
{
titulo[x] = threads[x].title.substring(0, 23) + '...';
//threads[x].title = threads[x].title.substring(0, 23) + '...';
}
document.writeln("<img height=\"1\" src=\"images/right_news_line.gif\" width=\"251\"><img class=\"inlineimg\" src=\"images/right_news_bullet.gif\" alt=\"ForoMU\" border=\"0\" /> <a target=\"_blank\" href=\"http://www.tuweb.com/forum/showthread.php?t="+threads[x].threadid+"\" title=\""+threads[x].title+"\">"+titulo[x]+"</a> <span class=\"t_news_b\">("+threads[x].poster+")</span><br />");
}
//-->
Lo hice al ojo, disculpa si no funciona
