random html +(hi)

Hi All I'm new to this list and I suppose fairly new to PHP - and hope that this question is in keeping with the type of thing that's usually asked. I'm trying to dynamically randomise a chunk of HTML that is used on a page, aka random image, so that each time a client opens the page [or refreshes] a part of the page changes. The chunks of HTML are saved in their own directory as .htm files. I was hoping to adapt the following code I have managed to cobble together to display random images: <?php // images in folder $total = "5"; // file type $file_type = ".htm, .gif, .jpg"; // dir location $image_folder = "dir/dir"; $start = "1"; $random = mt_rand($start, $total); $image_name = $random . $file_type; // print file name // echo "$image_name"; // display image // echo "<img src=\"$image_folder/$image_name\" alt=\"$image_name\" />"; ?> I'd like the code to take the HTML and place it in a <div></div>, probably using a <?php require (""); ?> (I think I'm OK with this once the code is sorted). However - I don't seem to be able to progress any further with this - I'm sure I'm missing something very basic - but I just can't get past this point. I'd be grateful for any pointers with this. TIA ange