Site skin CSS example.

skin.css

/**
 * Site Skin background ad.
 *
 * Example:
 *
 * <a id="skin" href="http://www.google.com"></a>
 */

/*----------------------------------( GLOBALS )----------------------------------*/

html,
body { height: 100%; }

/*----------------------------------( GRID )----------------------------------*/

.wiffle {
	background-color: #fff;
	border-width: 0 5px;
	border-style: solid;
	border-color: #fff;
	height: auto;
	min-height: 100%;
	_height: 100%;
	margin: 0 5px;
}

@media only screen and (min-width: 665px) {
	
	.wiffle { margin: 0 auto; }
	
}

@media only screen and (min-width: 1005px) {
	
	.wiffle {
		margin: 0 0 0 -490px;
		position: absolute;
		z-index: 2;
		left: 50%;
		top: 0;
	}
	
}

@media only screen and (min-width: 1345px) {
	
	.wiffle { margin: 0 0 0 -660px; }
	
}

/*----------------------------------( AD )----------------------------------*/

a#site_skin_1 { display: none; }

@media only screen and (min-width: 1005px) {
	
	a#site_skin_1 {
		width: 100%;
		_height: 100%;
		min-height: 100%;
		background-color: #314a11;
		background-image: url(ad970.png);
		background-repeat: no-repeat;
		background-position: center top;
		background-attachment: fixed;
		display: block;
		position: fixed;
		z-index: 1;
		_top: expression((ignoreMe = document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop) + 'px'); /* <= IE6 */
	}
	
}

@media only screen and (min-width: 1345px) {
	
	a#site_skin_1 { background-image: url(ad1300.png); }
	
}