var last
last=""

    	function show(objName) {
    		if (document.getElementById(objName).style.display == "none") {
    			if (last != "") {
    			document.getElementById(last).style.display = "none"
    			}
    			document.getElementById(objName).style.display = "block"
    			last = objName
    		}
    		else {
    		document.getElementById(objName).style.display = "none"
    		last = ""
    		}
    	}