function show_product(hodnota, hodnota_li)

   {
		document.getElementById("B1").style.display='none';
		document.getElementById("B1_li").style.background='background-image: none background-color: #7fafbd';

		document.getElementById("B2").style.display='none';
		document.getElementById("B2_li").style.background='background-image: none background-color: #7fafbd';

		document.getElementById("B3").style.display='none';
		document.getElementById("B3_li").style.background='background-image: none background-color: #7fafbd';

		document.getElementById("B4").style.display='none';
		document.getElementById("B4_li").style.background='background-image: none background-color: #7fafbd';

		document.getElementById(hodnota).style.display='block';
		hodnota_li.style.background='background-image: url(pics/right_cornerd.gif) no-repeat background-position: right background-color: #436e77';
}