To change the background/color of the header . . . . .
Within file path –> /templates/ja_tiris/css/template.css
look for the following line:
[FONT=arial]#ja-header .main-inner2 {
[/FONT]background: url(/images/bg-header.png) 0 100% repeat-x #141414;
padding-bottom: 10px;
padding-top: 10px;
}
All you have to do is change the background property to a hex color code of your choice.
Here are some resources for hex color codes . . .
http://www.2createawebsite.com/build/hex-colors.html
http://html-color-codes.com/
You will likely also need to modify the background color for your main navigation menu (if you want it to match your header color, that is). To do this, look for the following lines within the same template.css file
#[FONT=arial]ja-mainnav .main-inner2 {
[/FONT]background: url(/images/bg-nav.gif) 0 0 repeat-x white;
padding: 0;
}
Same thing . . . change the background property to a color or image of whatever you like.
Hope That Helps