function ukaz(kurz) {
	kurz = "t"+kurz+"-";
	sel = false;
	termin = document.getElementById('termin').childNodes;
	for(i=1;i<(termin.length-1);i++) {
		if (termin[i].id.match(kurz) != null) {
			termin[i].style.display = 'block';
			termin[i].style.color = 'black';
			if (sel == false) {
				termin[i].selected = true;
				sel = true;
			}
		}
		else
		termin[i].style.display = 'none';
		termin[i].style.color = 'white';
	}
}

function dynamicSelect(id1, id2) {
    if (document.getElementById && document.getElementsByTagName) {
        var sel1 = document.getElementById(id1);
        var sel2 = document.getElementById(id2);
        var clone = sel2.cloneNode(true);
        var clonedOptions = clone.getElementsByTagName("option");
        refreshDynamicSelectOptions(sel1, sel2, clonedOptions);
        sel1.onchange = function() {
            refreshDynamicSelectOptions(sel1, sel2, clonedOptions);
        };
    }
}
function refreshDynamicSelectOptions(sel1, sel2, clonedOptions) {
    while (sel2.options.length) {
        sel2.remove(0);
    }
    var pattern1 = /( |^)(select)( |$)/;
    var pattern2 = new RegExp("( |^)(" +
       sel1.options[sel1.selectedIndex].value + ")( |$)");
    for (var i = 0; i < clonedOptions.length; i++) {
        if (clonedOptions[i].className.match(pattern1) ||
           clonedOptions[i].className.match(pattern2)) {
            sel2.appendChild(clonedOptions[i].cloneNode(true));
        }
    }
}
window.onload = function() {
    dynamicSelect("kurz", "termin");
}