Strip characters javascript

[Jalo]

Hi all,

I use 3.8.2 and use this code to display latest threads on my portal:

<if condition="$vbulletin->options['externaljs']">
<script type="text/javascript" src="external.php?forumids=19&type=js"></script> 
<script language="" type="text/javascript">
<!--
for (x = 0; x < 7; x++)
{
document.writeln("<li><a href=\"showthread.php?t="+threads[x].threadid+"\">"+threads[x].title+"</a></li>");
}
//-->
</script>

<script type="text/javascript" src="external.php?forumids=30&type=js"></script> 
<script language="" type="text/javascript">
<!--
for (x = 0; x < 7; x++)
{
document.writeln("<li><a href=\"showthread.php?t="+threads[x].threadid+"\">"+threads[x].title+"</a></li>");
}
//-->
</script>
      </if>

But when a thread title is too long it takes up two lines breaking my layout. So I would like to set a max characters for the title to show and end with ...

How can this be done?

Jan