[VE][338] Error Message Feedback

Hi,

I have just found that there is a link on my site that is not valid xhtml 1.0.

Bellow is the code:
<script language="javascript" src="http://mysmarthost.org/livehelp/livehelp_js.php?relative=y&department=1&pingtimes=60"></script>

Could you please tell me how i could fix this as i have searched every were and cant find any thing.

Thanks
Geo