Last post today I hope.
I put this one up before, but going to try a simplified version.
I have two pages. sharing the same css stylesheet but
page one has
<body id=''one">
second page has
<body id=''two">
they both share the same header.php that only has the tag for <body id=''one">.

In the shared stylesheet.
#main{background: ulr('image1.png');}
#two{background: ulr('image2.png');}

how can I use jquery to change the background image when the user goes to the second page?

thank you