Included in the new version of XMS Systems that are to be released soon you will be able to open links into jquery pop-up modal windows.
To do this you need a bit of extra coding in your link.
First you need to append your url with two values.
http://thisisalink.com/some_page.html?width=220&height=225
When someone now click on the link it will grey out the background and open a window the size you specified with the target page inside the window.