function switchSearch(switchTo) {
	
	off1 = document.getElementById("search_simple");
	off2 = document.getElementById("search_extended");
	off3 = document.getElementById("search_categories");
	off1.style.display = off2.style.display = off3.style.display = "none";

	switch (switchTo) {
		case "extended":
			on = document.getElementById("search_extended");
			on.style.display = "block";
			act_search = on;
			break;
		case "categories":
			on = document.getElementById("search_categories");
			on.style.display = "block";
			act_search = on;
			break;
		default:
			on = document.getElementById("search_simple");
			on.style.display = "block";
			act_search = on;
	}
}

function checkForm(form) {
	if(form.stype.value == "1" || form.stype.value == "2") {
		if(form.query.value == "Suchbegriff") {
			form.query.style.color = "#d71e16";
			return false;
		}
		else if(form.query.value.length < 3) {
			form.query.value = "Suchbegriff";
			form.query.style.color = "#d71e16";
			return false;
		} else {
			return true;
		}
	} else if(form.stype.value == "3") {

		if(form.cat.value == "" && form.year.value == "" && form.loc.value == "") {
			form.cat.style.color = "#d71e16";
			form.year.style.color = "#d71e16";
			form.loc.style.color = "#d71e16";
			return false;
		} else {
			return true;
		}
	}
}
function resetField(form) {
	if(form.value == "Suchbegriff") {
		form.value='';
		form.style.color='#000';
	}
}
function resetSelect(form) {
	form.style.color='#000';
}