Today I was working on some code and I needed to programatically create a link with the ability to have a javascript pop up.  The code is as follows:

string javascriptLink = "<a href=\"javascript: void(0)\" onclick =\"window.open('YourPageHere.aspx', '', 'scrollbars=0');return false;\">javascript link</a>";

To take this code a little further as in my case I needed to pass a query string to the page I wanted to load.

Edit your string like so:

string javascriptLink = "<a href=\"javascript: void(0)\" onclick =\"window.open('YourPageHere.aspx?Id=" + yourId + "', '', 'scrollbars=0');return false;\">javascript link</a>";

where yourId is the variable you want to pass.

Let me know if it worked for you. It's just that easy!