Passing variable to Outlook

Hi, I am trying to pass a URL (as a variable) from an email link on a web page to outlook so that outlook opens and the URL is displayed in the message body. I know there is a way of passing the title, subject and body by coding them as part of the mailto link but I cannot find a way of doing the same using a variable instead of hard coding it. Thanks in anticipation. John

Argh. The quotes are messed up a bit.... Sure you can fix that yourself