var main_number_of_buttons = 6;
var main_buttons_name = new Array(main_number_of_buttons);
var main_button_dn = new Array(main_number_of_buttons);
var main_button_up = new Array(main_number_of_buttons);
main_buttons_name[0]='home';
main_buttons_name[1]='articles';
main_buttons_name[2]='books';
main_buttons_name[3]='photos';
main_buttons_name[4]='biography';
main_buttons_name[5]='contact';
main_button_up[0]=new Image();
main_button_dn[0]=new Image();
main_button_up[0].src = 'images/navigation/' + 'gNav_' + main_buttons_name[0] + '_off.gif';
main_button_dn[0].src = 'images/navigation/' + 'gNav_' +  main_buttons_name[0] + '_on.gif';
main_button_up[1]=new Image();
main_button_dn[1]=new Image();
main_button_up[1].src = 'images/navigation/' + 'gNav_' + main_buttons_name[1] + '_off.gif';
main_button_dn[1].src = 'images/navigation/' + 'gNav_' +  main_buttons_name[1] + '_on.gif';
main_button_up[2]=new Image();
main_button_dn[2]=new Image();
main_button_up[2].src = 'images/navigation/' + 'gNav_' + main_buttons_name[2] + '_off.gif';
main_button_dn[2].src = 'images/navigation/' + 'gNav_' +  main_buttons_name[2] + '_on.gif';
main_button_up[3]=new Image();
main_button_dn[3]=new Image();
main_button_up[3].src = 'images/navigation/' + 'gNav_' + main_buttons_name[3] + '_off.gif';
main_button_dn[3].src = 'images/navigation/' + 'gNav_' +  main_buttons_name[3] + '_on.gif';
main_button_up[4]=new Image();
main_button_dn[4]=new Image();
main_button_up[4].src = 'images/navigation/' + 'gNav_' + main_buttons_name[4] + '_off.gif';
main_button_dn[4].src = 'images/navigation/' + 'gNav_' +  main_buttons_name[4] + '_on.gif';
main_button_up[5]=new Image();
main_button_dn[5]=new Image();
main_button_up[5].src = 'images/navigation/' + 'gNav_' + main_buttons_name[5] + '_off.gif';
main_button_dn[5].src = 'images/navigation/' + 'gNav_' +  main_buttons_name[5] + '_on.gif';