var defaultValue = "";
var interests = "";

function init () {
	interests = document.getElementById("interest").innerHTML;
	document.getElementById("interest").innerHTML = '<option value="">Kategorie auswählen</option>';
}

function deleteDefaultValue(element) {
	var id = element.id

	if (defaultValue == "") {
		defaultValue = document.getElementById(id).value;
	}

	if (defaultValue == document.getElementById(id).value) {
		document.getElementById(id).value = "";
		document.getElementById(id).style.color = "#525252";
	}
}

function setDefaultValue(element) {
	var id = element.id

	if (document.getElementById(id).value == "") {
		document.getElementById(id).value = defaultValue;
		document.getElementById(id).style.color = "#b4b4b4";
	}
}

function changeCategory (category) {
	if (category.split("/").reverse()[1] == undefined) {
		document.getElementById("interest").style.color = "#b4b4b4";
		document.getElementById("interest").innerHTML = '<option value="">Kategorie auswählen</option>';
	} else {
		document.getElementById("interest").style.color = "#000000";
		document.getElementById("interest").innerHTML = interests;
		document.getElementById("interest").innerHTML = document.getElementById(category.split("/").reverse()[1] + "/").innerHTML;
	}
}