//start topstandard2 rollovers

if (document.images) {    
	// image 1
	img_1a = new Image();  	
	img_1a.src = "/nsimages/topnav_databank_onb.gif";           
	img_1b = new Image();
	img_1b.src = "/nsimages/topnav_databank_offb.gif";	
	// image 2
	img_2a = new Image();  	
	img_2a.src = "/nsimages/topnav_latest_onb.gif";           
	img_2b = new Image();
	img_2b.src = "/nsimages/topnav_latest_offb.gif";	
	// image 3
	img_3a = new Image();  	
	img_3a.src = "/nsimages/topnav_neighstats_onb.gif";           
	img_3b = new Image();
	img_3b.src = "/nsimages/topnav_neighstats_offb.gif";
	// image 4
	img_4a = new Image();  	
	img_4a.src = "/nsimages/topnav_statbase_onb.gif";           
	img_4b = new Image();
	img_4b.src = "/nsimages/topnav_statbase_offb.gif";	
	// image 5
	img_5a = new Image();  	
	img_5a.src = "/nsimages/topnav_themes_onb.gif";           
	img_5b = new Image();
	img_5b.src = "/nsimages/topnav_themes_offb.gif";	
	// image 6
	img_6a = new Image();  	
	img_6a.src = "/nsimages/topnav_timeseriesdata_onb.gif";           
	img_6b = new Image();
	img_6b.src = "/nsimages/topnav_timeseriesdata_offb.gif";	

}

function swapover(n) {
	if (document.images) {
 	    document[n].src = eval( n + "a.src");
    }
}
	
function swapout(n) {
	if (document.images) {
	    document[n].src = eval(n + "b.src");
    }
}

//end topstandard2 rollovers




//start browser sniffer

//set variables to take account of netscape    
var agt=navigator.userAgent.toLowerCase();
var is_major = parseInt(navigator.appVersion); 
var is_ie   = (agt.indexOf("msie") != -1); 
var is_mac    = (agt.indexOf("mac")!=-1);
var is_ie3  = (is_ie && (is_major < 4)); 
var is_ie4  = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")==-1) && (agt.indexOf("msie 5.5")==-1) && (agt.indexOf("msie 6.0")==-1));
var is_ie4up  = (is_ie  && (is_major >= 4) && (!is_mac)); 
var is_ie5up  = (is_ie  && !is_ie3 && !is_ie4 && (!is_mac));

//end browser sniffer