have a look here:
Code:
<?php session_start();
ob_start();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="XHTML namespace">
<?php
$style_set = "_1";//set the default
if(@$_REQUEST['style'] <> ""){
$style_set = $_REQUEST['style'];
$_SESSION['set_style'] = $style_set;
header("Location: ".$_SERVER['PHP_SELF']);//redirect so we can show the changes to the style
}
if(isset($_SESSION['set_style'])){$style_set = $_SESSION['set_style'];}
//set style if session isset
?>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<?php
echo "<link rel=\"stylesheet\" href=\"style$style_set.css\" media=\"all\" />";
?>
</head>
<body>
<form name="select_style" action="x_style_set.php" method="post">
<select name="style" onChange='this.form.submit();'>
<option value='_1' <?php if($style_set == "_1"){echo "selected";}?>>style 1</option>
<option value='_2' <?php if($style_set == "_2"){echo "selected";}?>>style 2</option>
</select>
</form>
<?php echo "your style that you have selected is - <b>style$style_set.css</b>";?>
</body>
</html>