Div placement

I’m having trouble understanding what I’m doing wrong.

In <div id=“left”> I need to place a few boxes that sit underneath each other.

So fare I have set <div id=“box1”> position to relative and added left: 104px and top: 108px placement. This box is now sitting exactly where I want it.

Now I’d like to add another box beneath called <div id=“box2”>. I’ve given it a height, width and set the position to relative, but the box doesn’t position in the top left corner of <div id=“left”>

Why is this so?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title></title>
<style type="text/css">
body {
	margin: 0px;
	padding: 0px;
}

#wrapper {
	height: 780px;
	width: 850px;
	margin:0px auto;
}
#left {
	height: 780px;
	width: 363px;
	float: left;
	background-color: #666;
	position: relative;
	margin: 0px;
	padding: 0px;
}
#right {
	height: 780px;
	width: 487px;
	float: left;
	background-color: #999;
	position: relative;
}
#slideshow_container {
	height: 567px;
	width: 388px;
	position: relative;
	left: 0px;
	top: 108px;
	background-color: #e2e3e4;
}
#slideshow {
	height: 548px;
	width: 369px;
	position: relative;
	left: 9px;
	top: 8px;
	background-color: #FFF;
}
#box1 {
	position: relative;
	height: 82px;
	width: 251px;
	left: 104px;
	top: 108px;
	background-color: #e2e3e4;
}
#box2 {
	height: 150px;
	width: 251px;
	background-color: #F00;
	position: relativ;
}
</style>
</head>
<body>
<div id="wrapper">
  <div id="left">
    <div id="box1">BOX1</div>
    <div id="box2">BOX2</div>
  </div>
  <div id="right">
    <div id="slideshow_container">
      <div id="slideshow"></div>
    </div>
  </div>
</div>
</body>
</html>