Trouble loading link

Hello, Im kinda new to html and all, but i am learing alot. I am wanting to put a link in my page. and it gives an error 500. Kinda like 404? doesnt load or find page.

If i go to thier home page first, then try to load link it works fine. but if no (history, cookies or temp internet files)? then it wont load.
any ideas?
Also i left the part with “?QL=1” because there html sample for the link box had it, but with there homepage. I tried both with and with out that.

any ideas? I would be very greatful. thanks!

here is a part of my html:

 
 
 
<div class="tail container"><a href="http://www.sierraflowerfinder.com/sys_cat.asp?QL=1" target="_new" class="img-left">
<img src="http://www.sierraflowerfinder.com/images/banners/banner_medium_07.jpg" border="0" alt="Click here to visit Sierraflowerfinder.com"></a><br /