background effect

As I do a background effect as in this image? is there any effect within construct 2 serve for this?

Or how to do it with photoshop: P

<img src="http://i49.tinypic.com/35ho289.jpg" border="0" />

I want to make a distant background that does not disturb the character

It looks blurred and desaturated. I'd recommend doing it in Photoshop for maximum cross-browser/device compatibility, though it can be done with WebGL effects too.

In Photoshop:

Filter -> Blur -> Gaussian Blur

Image -> Adjustments -> Hue/Saturation (slide the saturation down)

Also if you want to know some theory behind this:

The blur is emulating either eye or lens defocus (lens is easier to denote and explain).

The reduction in saturation is called aerial perspective, and is due to light scattering from air and water particles. Here's some further reading: http://en.wikipedia.org/wiki/Aerial_perspective

try it but is not nor similar <img src="smileys/smiley18.gif" border="0" align="middle" />

thanks anyway

You'll need to be more specific - post images.