Нужно разобраться

[Cocka]

ниже приведенный скрипт является ролловерным.
к сожелению я не могу понять куда что добовлять, пытался добавлять имена картинки в корневой папке, ничего не вышло

<?PHP // Basic rollover image class works fine for all browsers and up to 1 layer
class rollover {

VAR $dirapp ; // root directory for the web
VAR $layer ; // layer where the img is placed
VAR $imgname ; // name in <img name="..."
VAR $baseimg ; // src for the base image (deactivated)
VAR $selimg ; // src for the alt image (selected)
VAR $alt ; // alt text
VAR $link ; // link for the image

function rollover($dirapp,$layer,$imgname,$baseimg,$selimg, $alt="",$link="#") {
$this->dirapp = $dirapp ;
$this->layer = $layer ;
$this->imgname = $imgname ;
$this->baseimg = $baseimg ;
$this->selimg = $selimg ;
$this->alt = $alt ;
$this->link = $link;
}

function preload() {
// MUST BE CALLED WITHIN <SCRIPT></SCRIPT> SECTION
echo "preload('" . $this->imgname . "bas','". $this->dirapp . "images/" . $this->baseimg . "');\n" ;
echo "preload('" . $this->imgname . "sel','". $this->dirapp . "images/" . $this->selimg . "');\n" ;
}

function image() {
$size = GetImageSize($dirapp . "images/" . $this->baseimg) ;
if ($this->layer == "") {
echo "<a href='" . $this->link . "' onMouseOver=\"javascript:changeImage(null,'" . $this->imgname ."','".$this->imgname . "sel')\" onMouseOut=\"javascript:changeImage(null,'".$this->imgname ."','".$this->imgname . "bas')\"><img name='" . $this->imgname . "' border=0 width=" . $size[0] . " height=" . $size[1] . " src='" . $this->dirapp . "images/".$this->baseimg ."' alt='" . $this->alt . "'></a>" ;
} else {
echo "<a href='" . $this->link . "' onMouseOver=\"javascript:changeImage('" . $this->layer . "','" . $this->imgname ."','".$this->imgname . "sel')\" onMouseOut=\"javascript:changeImage('" . $this->layer . "','".$this->imgname ."','".$this->imgname . "bas')\"><img name='" . $this->imgname . "' border=0 width=" . $size[0] . " height=" . $size[1] . " src='" . $this->dirapp . "images/".$this->baseimg ."' alt='" . $this->alt . "'></a>" ;
}
}
}
?>

жду ответов