var selected = 1;
var id_max = 5

function seltab(num) {
	if(selected == num) return;
	if(!document.getElementById)return;
	
	//hide selected
	var box = document.getElementById("box" + selected.toString());
	var head = document.getElementById("head" + selected.toString());
	if(box && head) {
		box.style.display = "none";
		head.className = "close";
	}
	
	//show new selection
	selected = num;
	for(var i=1; i<=id_max; i++) {
		var box = document.getElementById("box" + i.toString());
		var head = document.getElementById("head" + i.toString());
		if(!box || !head) continue;
		if(selected == i) {
			head.className = "open";
			box.style.display = "block";
		} else {
			head.className = "close";
			box.style.display = "none";
		}
	}
}