function showCenters()
{
	var sID = "";
	for (var i=0;i<arguments.length;i++)
	{
		sID += arguments[i];
		if (i < (arguments.length - 1))
			sID += ",";
	}
	with (document.frmMap)
	{
		hidID.value = sID;
		submit();
	}
}