function do_mouseover(id, stage){ 
	if (document.getElementById(id)) {
		if (stage == 'on') { document.getElementById(id).style.visibility = "visible"; } else { document.getElementById(id).style.visibility = "hidden"; }
	}
}
function do_link(id, stage){ 
	if (document.getElementById(id)) {	
		if (stage == 'on') { document.getElementById(id).className = "mouseover_on"; } else { document.getElementById(id).className = "mouseover_off"; }
	}
}
function change_max_no_images(max_no_images) {
	document.uiForm.max_no_images.value = max_no_images;
	document.uiForm.submit();
} 
function change_offset(offset) {
	document.uiForm.offset.value = offset;
	document.uiForm.submit();
} 
function change_image_size(image_size) {
	document.uiForm.image_size.value = image_size;
	document.uiForm.submit();
}