Hi there delboy1875,
in your "styleslider.css" file, add the highlighted attribute and the height value shown here...
[color=navy]
#banner {
width:962px;
height:[color=red]437[/color]px;[color=red]
clear:both;[/color]
}[/color]
...to the rule. 
Also note that if you are going to use these type of attributes...
[color=navy]
data-thumb="../themes/toystory.jpg"
data-transition="slideInLeft"[/color]
...then you should change this...
[color=navy]
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>[/color]
...to this...
[color=navy]
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"> [/color]
coothead