function filterFunction(noFilter="", match="", noMatch="none") {
    var input, filter, div, textDiv, i;
    input = document.getElementById("myInput");
    filter = input.value.toUpperCase();
    div = document.getElementById("myDropdown");
    textDiv = div.getElementsByTagName("div");
    for (i = 0; i < textDiv.length; i++) {
	txtValue = textDiv[i].getAttribute("text");
	if (filter.length == 0) { // No search filter
	    textDiv[i].style.display = noFilter;
	} else if (txtValue.toUpperCase().indexOf(filter) > -1) { // Search filter matches
	    textDiv[i].style.display = match;
	} else {  // Search filter does not match
	    textDiv[i].style.display = noMatch;
	}
    }
}