Image dimensions different in Xara and browser?

[MEB]

Try this first: draw a (white in this case) rectangle with 960px x 135px and put it behind your group. Make sure everything is inside the new rectangle. Group everything and export. You should get the right dimensions.

To attach an image/file in this forum:
You have to select the clip icon when you are writing/editing your post. A new browser window will appear. Select add files button on top right corner. A new box appear. Click on Select Files button. A regular OS file manager window will appear. Select the file you want to upload.The file will show up in the previous box. Click upload files button.
The the file now will appear in the initial browser window already selected. You just have to click Insert Inline button at the bottom to add it to your post.
Pretty simple uh?