function tabMenu(myID,maxNum){
	
	for (i = 1; i <= maxNum; i = i +1){
		document.getElementById("tab"+i).className ="off";
		document.getElementById("tab"+i+"cont").style.display="none";
	}
	document.getElementById(myID).className ="on";
	document.getElementById(myID+"cont").style.display="block";
	
}