Do you want the link to open in a new window?
If so try this code with the size, other options and url.html adjusted to suit
Code:
<a href="#"onclick="window.open('url.html','new','toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=yes, resizable=no, copyhistory=yes, width=785, height=500')"><u>here</u></a>