if (document.images) {
	aboutoff = new Image (0,0);
	peopleoff = new Image (0,0);
	jobsearchoff = new Image (0,0);
	peoplesearchoff = new Image (0,0);
	companiesoff = new Image (0,0);
	
	abouton = new Image (0,0);
	peopleon = new Image (0,0);
	jobsearchon = new Image (0,0);
	peoplesearchon = new Image (0,0);
	companieson = new Image (0,0);

	aboutoff.src = "button_about.gif";
	peopleoff.src = "button_people.gif";
	jobsearchoff.src = "button_search_jobs.gif";
	peoplesearchoff.src = "button_search_people.gif";
	companiesoff.src = "button_companies.gif";

	abouton.src = "button_about_on.gif";
	peopleon.src = "button_people_on.gif";
	jobsearchon.src = "button_search_jobs_on.gif";
	peoplesearchon.src = "button_search_people_on.gif";
	companieson.src = "button_companies_on.gif";
	
}

function act(imgName) {

	if (document.images) {
		document[imgName].src = eval(imgName + 'on.src');
	}
   
}

function inact(imgName) {

	if (document.images) {
		document[imgName].src = eval(imgName + 'off.src');
	}
   
}