function init() {
}

function selectAllCategories(b) {
	for(i=0; i<document.f.elements.length; i++) if(document.f.elements[i].name.substring(0,9) == "category_") document.f.elements[i].checked = b;
}

var alerted = false;
function countCat() {
	if(!alerted) {
		var es = document.f.elements;
		var c = 0;
		for(i=0; i<es.length; i++) {
			if(es[i].name && es[i].name.substring(0,9) == "category_" && es[i].checked) c++;
		}
		if(c > 3) {
			alert("A maximum of three categories is recommended");
			alerted = true;
		}
	}
}