function showImage($site,$img){

//alert($gallery_image[$site][$img]);
$main_img = document.getElementById('galleryimg');
$main_img_txt = document.getElementById('imgalttxt');

$main_img.src = $gallery_path + $gallery_site[$site][1]+"/"+$gallery_image[$site][$img];
$main_img.alt = $gallery_alt[$site][$img];
$main_img_txt.childNodes[0].nodeValue = $gallery_alt[$site][$img];
}