function swapImg($oSrcImg, $iAction) {
	$imgname = $oSrcImg.src;		
	if ($iAction == 1) {
		$newsrc = $imgname.replace('.gif','_d.gif');	
	} else {
		$newsrc = $imgname.replace('_d.gif','.gif');
	}
	$oSrcImg.src = $newsrc;
}