function buttonOn(obj_name,dir) {
	document.getElementById("btn_"+obj_name).src = "../_images/"+dir+"/navbar_" + obj_name + "_on.gif";
}
function buttonOff(obj_name,dir) {
	document.getElementById("btn_"+obj_name).src = "../_images/"+dir+"/navbar_" + obj_name + "_off.gif";
}

// Preload navbar images
(new Image()).src = '../_images/global/navbar_home_on.gif';
(new Image()).src = '../_images/global/navbar_aboutus_on.gif';
(new Image()).src = '../_images/global/navbar_affiliations_on.gif';
(new Image()).src = '../_images/global/navbar_analysis_on.gif';
(new Image()).src = '../_images/global/navbar_contact_on.gif';
(new Image()).src = '../_images/global/navbar_customsystems_on.gif';
(new Image()).src = '../_images/global/navbar_docbuilder_on.gif';
(new Image()).src = '../_images/global/navbar_industry_on.gif';
(new Image()).src = '../_images/global/navbar_news_on.gif';
(new Image()).src = '../_images/global/navbar_portfolio_on.gif';
(new Image()).src = '../_images/global/navbar_prefab_on.gif';
(new Image()).src = '../_images/global/navbar_pubworks_on.gif';
(new Image()).src = '../_images/global/navbar_qatester_on.gif';
(new Image()).src = '../_images/global/navbar_store_on.gif';
(new Image()).src = '../_images/global/navbar_team_on.gif';
(new Image()).src = '../_images/global/navbar_technologies_on.gif';
(new Image()).src = '../_images/global/navbar_trademark_on.gif';
(new Image()).src = '../_images/global/navbar_whychoose_on.gif';
(new Image()).src = '../_images/global/navbar_aabastore_on.gif';