Okay...
Step1 - You need a background image, you can resize it to 1663px wide (width of template) and at least 800px high.
Step2 - create a folder in in your site -> templates/rt_tachyon_j16/images/page_backgrounds
Step3 - Make sure Template Manager -> Advanced -> Page Class Suffixes is set to YES
Step4 - Go to the page you want the special background. Using Firebug (preferred) or the browsers "View Page Source" option, look at this line<body class="bodylevel-high modulehover-1 readonstyle-button fixedheader-0 font-family-helvetica font-size-is-large menu-type-fusionmenu col12 option-com-content menu-ciasa" style="position: relative; min-height: 100%; top: 0px;">
The menu-ciasa is the Page Class Suffix for the CIASA page.
Step5 - Using Firebug find the CSS path for the background image. In your case it would be div#rt-body-background. This element tag is used for all the templates page backgrounds. So we have to make it specific for the CIASA page. That's where menu-ciasa comes on. You would preface the background element tag with our page class suffix so it looks like this:.menu-ciasa div#rt-body-background
Now that we have specified our element we need the CSS code for that element. Modifying the original code for div#rt-body-background we have:{background: url(/"../images/page_backgrounds/swimming.jpg") no-repeat scroll 0 0 transparent;}
Putting it all together we have our CSS code:/* Page Backgrounds */
.menu-ciasa div#rt-body-background {background: url("../images/page_backgrounds/swimming.jpg") no-repeat scroll 0 0 transparent;}
The/* Page Backgrounds */
is too help remind you this is your code and if you ever upgrade the template it makes it easier to find custom code changes that have to be carried over to the new CSS files.
So this is what it should look like when your done:
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