[support] Path question

I have create a block that has some basic html links like <a href="/nestor/scroller612/as_dept/as_main">Admin Services</a> This works but if I were to move my drupal site this will not work. If I were to set the link as follows it will not work <a href="as_dept/as_main">Admin Services</a> Now what is the proper way to point to a link ina drupal page? How do you tell it to use the drupal site path + the location of the link you want to access? Thanks, Nestor :-)