function handleInput() {
//	alert("zeitraum = "+document.form1.zeitraum.value);
	if(document.form1.kategorie.options[document.form1.kategorie.selectedIndex].value == "galerien" ||
	   document.form1.kategorie.options[document.form1.kategorie.selectedIndex].value == "kuenstler"){
	   		document.form1.zeitraum.style.visibility = "hidden";
			document.form1.zeitraum.value = "alle";
			var myDiv = document.getElementById("zeitraum_label");
			myDiv.style.visibility = "hidden";
	}
	else {
		document.form1.zeitraum.style.visibility = "visible";
			var myDiv = document.getElementById("zeitraum_label");
			myDiv.style.visibility = "visible";
	}
	
	var div = document.getElementById("galerie_schwerpunkt");
	if(document.form1.kategorie.options[document.form1.kategorie.selectedIndex].value == "galerien"){
		div.style.display  = "block";
	}
	else {
		div.style.display  = "none";
		document.form1.technik.value = "alle";
		document.form1.kunstrichtung.value = "alle";
	}
	
//	alert("zeitraum = "+document.form1.zeitraum.value);
}