var lastDisplayed = "";

function geographyShowHide(cid) {
	//alert("current aa cid  : " + cid + "\nprevious cid : " + lastDisplayed);
	
	document.getElementById("introduction").style.display = "none";
	
	
	if(lastDisplayed != "") {
		document.getElementById(lastDisplayed).style.display = "none";
	}
	
	document.getElementById(cid).style.display = "block";
	
	lastDisplayed = cid;
	//alert("current cid  : " + cid + "\nprevious cid : " + lastDisplayed);
}