function checkCategoriesLength(obj)
{
	var counter = 0;
	
	for (i = 0, j = categories.length; i < j; ++i) {
		if (document.getElementById(("category_" + categories[i])).checked) {
			counter++;
		}
	}
	if (counter > category_limit) {
		obj.checked = false;
		alert("Sie können maximal nach " + category_limit + " Kriterien sortieren.");
	}
}

function checkCategoryBox()
{
	document.getElementsByName("params[order]").checked = false;
	document.getElementById("categoryBox").checked = "checked";
}

function showText(id)
{
	infotext = document.getElementById(id);
	infotext.style.display = "block"
}

function hideText()
{
	infotext.style.display = "none";
}