/* This javascript copyright @URL Internet Consultants. 
   1998 all Rights Reserved.
   Author: Derek Tearne 
   */

if (document.images){
        var active_array = new Array(document.images.length);
        var plain_array = new Array(document.images.length);
}
function browser_ok(){
    var version_ok = 0;
    var browser_version = parseFloat(navigator.appVersion);
    if ( navigator.appName == "Netscape" && browser_version > 2){
        version_ok = 1;
    }
    if ( navigator.appName != "Netscape" && browser_version >= 4){
        version_ok = 1;
    }
    return(version_ok);
}

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

                   // alert ( counter + " " + document.images[counter].name + " " + document.images[counter].src);
                        }
                }
        }
}
  
          
function active(imagename) {
        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 + "_mo.gif";               
                load_alt_images();
                }       
        }
}

function inactive(imagename) {

        if (document.images) 
                document[imagename].src = plain_array[imagename].src;
}