function select(id_num)
	{
		var i;
		for (i = 1; i <= 4; i++)
		{
			var tl = document.getElementById("tlac"+i);  //b   utton
			var pol2 = document.getElementById("pole2"+i);
			var nadp2 = document.getElementById("nadpis2"+i);
			var pol4 = document.getElementById("pole4"+i);
      var first = document.getElementById("firstl"+i); //first letter of button

			if (i == id_num)
			{
				tl.style.backgroundColor = "#505050";
				tl.style.color = "#ffffff";
				tl.style.paddingBottom = "6px";
				pol2.style.display = "block";
        nadp2.style.display = "block";
        pol4.style.display = "block";
        first.style.textDecoration = "none";
        first.style.color = "#ffffff";
			}
			else
			{
				tl.style.backgroundColor = "#cdcdcd";
				tl.style.color = "#060606";
				tl.style.paddingBottom = "4px";
				pol2.style.display = "none";
				nadp2.style.display = "none";
        pol4.style.display = "none";
        first.style.textDecoration = "underline";
        first.style.color = "#060606";
			}
		}
	}