How to change background image

Hello,

I have the same image on all pages and categories but I don´t know how to change it. I found only one place where this slide is in code style.css

/* EasyTooltip */
.tooltip {
	background: none repeat scroll 0 0 #252525;
	border: 1px solid #000000;
	color: #EEEEEE;
	display: none;
	font-size: 11px;
	line-height:1.2em;
	margin: 13px 0 0;
	padding: 5px;
	z-index:99;
}

.row-top {
	width:100%;
	background:url(images/bg-tail.gif) center 0 repeat;
	padding:0 0 10px 0;
	position:relative;
	z-index:9;
}

.bg-row {
	width:100%;
	background:url(images/bg-tail.gif) center 0 repeat;
}
	.bg-row div {
		width:100%;
		height:274px;
		background:url(images/slide5.jpg) center 0 no-repeat;

background:url(images/slide5.jpg) center 0 no-repeat;
this is only one place where I found the url name of this image…
I tried to change it here but it is still there :/ .