function rollOver(img)
{
	var old_src=img.src;
	var pict_path=old_src.split('/');
	var pict_name=pict_path.pop();

	pict_name='over_' + pict_name;
	img.src=pict_path.join('/') + '/' + pict_name;
}

function rollOut(img)
{
	var old_src=img.src;
	var pict_path=old_src.split('/');
	var pict_name=pict_path.pop();

	pict_name=pict_name.split('_')[1];
	img.src=pict_path.join('/') + '/' + pict_name;
}