function showHide(){
	var num = document.getElementById("areas").value;
	//document.getElementById("head" + num + "a").style.display = displaya;
	//document.getElementById("head" + num + "b").style.display = displayb;
	//document.getElementById("tbl" + num).style.display = display;
	for(var i = 1; i < 5; i++){
		if (i == num){
			document.getElementById("div"+i).style.display = "block";
		}else{
			document.getElementById("div"+i).style.display = "none";
		}
	}
}