How i can change div's with F5!

[STAUFFi]

Hey Guys i want change some themes with F5.
my css are

div#container2
{
	background:url('images/background_3.png'); 
	background-repeat:no-repeat; 
	background-position:center 0; 
	width:800px; 
	height:700px; 
	position: relative;
	margin-top: 0px;
	margin-left: auto;
	margin-right: auto;
	margin-bottom:0px;
	text-align: left;
	overall:hidden; 
}

i will change container 1 with 2 with 3 with 4 ....
need help.
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