your designer possibly needs to learn to work with a tool such a Firebug to identify which styles to edit; http://getfirebug.com/
as you are working with a commercial theme, please ask the theme’s seller for support.
It’s a CSS issue, look at line 300 in the custom.css file and remove the border-top attributes of .custom #footer_area.
Right now its styled as border-top: 1px solid #BBBBDD (or something similair). Remove it and the blue line is gone.
And yes, I’ve used Firebug for that 😉
thanks to both of you, and especially for the resolution!! firebug… interesting. 🙂