Mailto is launching email ok but also launching blank web page

i am using AS3 on a website. Part of the AS has been setup by an external source and I ma now updating and adapting it. My knowledge of AS is limited but slowly expanding.

Currently the site is a main flash file with all the content delivered via a main.as file and then populated via images and videos held in folders on the web.

In one section we have an email link.

I was using Email: <a href='mailto:name@company.com>contact@company.com</a> and it worked fine. It launched the email program and put the email address in ready to go.

When I added the subject element as below

Email: <a href='mailto:name@company.com.?subject=Email%20Enquiry'>contact@company.com</a>

it now does what it should with the email program but it also opens a blank webpage.

What can I do to get rid of the blank web page opening?

thanks in advance