function prepni(elm,obr)
{
	if (elm.style.display=='none')
	{
		// rozbalujeme
		//elm.style.display='block';
		/*if(/MSIE/.test(navigator.userAgent))
		{
			elm.style.display='block';
		} else {*/
			Effect.DefaultOptions.duration=0.5;
			Effect.DefaultOptions.fps=15;
			Effect.BlindDown(elm);
		//}
		obr.alt='Zbaliť';
		obr.title='Zbaliť';
		obr.src='./img/collapse.png';
	} else {
		// zbalujeme
		//elm.style.display='none';
		/*if(/MSIE/.test(navigator.userAgent))
		{
			elm.style.display='none';
		} else {*/
			Effect.DefaultOptions.duration=0.5;
			Effect.DefaultOptions.fps=15;
			Effect.BlindUp(elm);
		//}
		obr.alt='Rozbaliť';
		obr.title='Rozbaliť';
		obr.src='./img/expand.png';
	}
}