Combo box does not change result

[artfuldodger]

I have this code below that creates a combo dropdown list that the user can use to select how many images ($MAXEMLEMENTSP ERPAGE)I have set caption to be 1 the problem is I can't figure out how to get the combo box change the value of the user selected to loadthat page and shows the number of images the user wants I am using $xml = simplexml_load_ file("xml/images.xml"); to load the image elements and then $maxpage to paginate the images if I change $cation to 5 then it displays 5 images per page the problem I have is at the moment I haven't found a way of passing the selected value to $caption to refresh the
page with its new value

select name="mydropdownlist">
	<?php
	$caption = 1;	                  
	
	$options = array('2' => '2',
					 '3' => '3',
					 '4' => '4');

			foreach($options as $value => $caption)
	   { 
				if(isset($_GET['caption']))
		{
			$caption = $_GET['caption'];   //if page is specif
		}
					echo "<option value=\"$value\" selected=\"$value\">$caption</option>";
					
	   }
	?>
 </select>
<?php
	$page = 0;
	$MAXELEMENTSPERPAGE = $caption; //change this value to display how many elements per page you wish people to see
	$maxPage = count($xml)/$MAXELEMENTSPERPAGE;

	if(isset($_GET['page']))
	{
		$page = $_GET['page'];   //if page is specif
	}

	?> <?php
	for($i =$page * $MAXELEMENTSPERPAGE ; $i< ($page * $MAXELEMENTSPERPAGE ) +$MAXELEMENTSPERPAGE ; $i++)
					{
						//start the foreach loop
						$imageProp = $i;

						if($i >= count($xml))
						{
							break;
						}
 ?>
 Page:
<?php
if($page > 0){
	?>
	<a href=<?php echo $_SERVER["PHP_SELF"]."?page=".($page-1); ?>>Previous </a>
	<?php
}

for($i = 0; $i< $maxPage; $i++ ){
	//here we are making a loop for how many pages we have
	//we then spawn a hyperlink for each page
	//$Server["php_self"]  returns the current page url
	//then we append the page number to it

	?>

	<a href=<?php echo $_SERVER["PHP_SELF"]."?page=".$i; ?>><?php echo $i;?></a>
	<?php
}
?>
<?php
if($page < floor($maxPage)){
	?>

	<a href=<?php echo $_SERVER["PHP_SELF"]."?page=".($page+1); ?>> Next </a>
	<?php
}
?>

I am a newbie to php any help would be appreciated