How do I add a link to confirmation email?

[Chargin]

define('EMAIL_THANKS_FOR_SHOPPING','Thanks for shopping with us today!');

I tried

define('EMAIL_THANKS_FOR_SHOPPING','Thanks for shopping with us today!<br>Please <a href="http://www.url">click here.</a>');

But it comes through as text, excluding the "<a href .." etc

How do I get a link in there?

[win8win]

not here,

i think you should write code below where showing "EMAIL_THANKS_FOR_SHOPPING";