<!--
function show_hide( layerName, layerNum, layerLetter ) {

    if ( document.getElementById ) {
        var divID;
		var reponse = new Array(layerNum);
		var i=1;

        while(i<=layerNum){
            divID=layerLetter + i;
			reponse[i] = document.getElementById( divID );
			if(reponse[i]) reponse[i].style.display = 'none';
			i++;
			};

		reponse[layerName.replace(layerLetter, "")].style.display = 'block';

		}
    }
-->