function browser_ok(){
    var version_ok = 0;
    var browser_version = parseFloat(navigator.appVersion);
    if (navigator.appName == "Netscape"){
        version_ok = 1;
    }
    if (navigator.appName != "Netscape" && browser_version >= 4){
        version_ok = 1;
    }
    return(version_ok);
}



if (document.images){
	var active_array = new Array(document.images.length);
	var plain_array = new Array(document.images.length);
}


function load_alt_images (){

	if (document.images && browser_ok()) {

		active_array.length = document.images.length;
		plain_array.length = document.images.length;
		for (counter = 0; counter < document.images.length; counter++){

			if (document.images[counter].name){
				var name = document.images[counter].name;
				plain_array[name] = new Image();
				plain_array[name].src = "images/Nav/" + document.images[counter].name + ".gif";

				active_array[name] = new Image();				
				active_array[name].src = "images/Nav/" + document.images[counter].name + "_ro.gif";

    		   // alert ( counter + " " + document.images[counter].name + " " + document.images[counter].src);
			}
		}
	}
}
  
          
function active(imagename) {
// alert ("imagename = " + imagename + document[imagename].src);
	if (document.images){
	    if (active_array[imagename]){
   			document[imagename].src = active_array[imagename].src;   
    	} else {
    		plain_array[imagename] = new Image();
    		plain_array[imagename].src = document[imagename].src;
    		active_array[imagename] = new Image();
    		active_array[imagename].src = "images/Nav/" + imagename + "_ro.gif"; 		
			load_alt_images();
		}	
	}
}

function inactive(imagename) {

	if (document.images) 
		document[imagename].src = plain_array[imagename].src;
}
function popIt(pop_url, pop_winname, width, height) {

    openWin = window.open(pop_url,pop_winname,"top=60,left=100,width=" + width + ",height=" + height + ",buttons=no,scrollbars=yes,location=no, menubar=no,resizable=yes,status=no,directories=no,toolbar=no");
 
    openWin.focus();
	return(false);
}