//preload images for navigation
subnav_about_on = new Image();
subnav_about_on = '../images/subnav_about_on.gif';

subnav_know_on = new Image();
subnav_know_on = '../images/subnav_know_on.gif';

subnav_office_on = new Image();
subnav_office_on = '../images/subnav_office_on.gif';

subnav_contact_on = new Image();
subnav_contact_on = '../images/subnav_contact_on.gif';

subnav_really_on = new Image();
subnav_really_on = '../images/subnav_really_on.gif';

subnav_smart_on = new Image();
subnav_smart_on = '../images/subnav_smart_on.gif';

subnav_start_on = new Image();
subnav_start_on = '../images/subnav_start_on.gif';

subnav_who_on = new Image();
subnav_who_on = '../images/subnav_who_on.gif';

//stop preloadin' images

function navOn(imName) {
		if (document.images) { 
		document.images[imName].src = '../images/' + imName + "_on.gif"
			 };
}
function navOff(imName) {
		if (document.images) { 
		document.images[imName].src = '../images/' + imName + '.gif' 
		};
}