Rich Text Formula to Open URL In New Window

Hi all,

I wanted to create some buttons on a form in my app that show an image, and clicking on it sends you to a URL.

the field type is Formula - Rich Text and the code is below...

"<a href=\"MyURL"><img src=\"MyImage" width=125></a>"

this formula works but opens the URL in the same window. Can someone please advise how i would amend this code to have the link open up in a new window?

I chopped together this formula from the magic buttons app and i tried searching the forum for the answer but to no avail

Thanks in advance :-)