Change STeel__BG.gif

[Leonardo]

Hi to all.
It would like to change the Steel__BG.gif image that is of deep.
I changed in this address /zimbra/img/loRes/skins/steel/Steel__BG.gif.
When I brought up to date modified, but when I entered in the webmail, he kept old the Steel__BG.gif image.
How I modify so that after entering in the webmail, it it keeps the image that I changed?
I am thankful anticipatedly.
It forgives me for the errors
Leonardo
Brazil

[KevinH]

This file is combined at build time with other images. So to change it you'd need to change the source then get the ImageMerge tool from our source and re-combine the images. In the next version you can make all these changes with CSS, so might be worth trying a test of 3.2 for this work.