We are still not exactly sure of what you are trying to achieve. As Glenn has pointed out, it would appear that there has been an attempt at "blending" the blank sidebox with the categories sidebox.
This will need to be fixed first.
If you need to determine the STRUCTURE of an internal link, which you will then render as a hyperlink in a custom sidebox, the easiest way to see the format of an internal link is to call up the page in a browser and look at the browser's URL location bar.
For example, a link to your CONTACT US page will show as:
http://www.yourwebsite.com/index.php...age=contact_us.
You need only the RELATIVE path to the page in question, as the link is internal, so your hyperlink would read:
<a href="index.php?main_page=contact_us" />Contact Us</a>
Now... if you wanted to apply bespoke STYLING to these links, you would encase the hyperlinks in an element that can be defined in the stylesheet:
<div id="myStyleName"><a href="index.php?main_page=contact_us" />Contact Us</a></div>
And then you add to your stylesheet.css ...
#myStyleName {whatever declarations apply}
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