// Netscape 3.0 compatibility (image swapping)
compat = false;
if( parseInt( navigator.appVersion ) >= 3 ) {
	compat = true; 
}
        
// cache images 
if( compat )
{

	imgHome = new Image();
	imgHome.src = "/images/menu/Home.jpg";
	imgHome_o = new Image();
	imgHome_o.src = "/images/menu/Home_o.jpg";	
	
	imgCourse = new Image();
	imgCourse.src = "/images/menu/Course.jpg";
	imgCourse_o = new Image();
	imgCourse_o.src = "/images/menu/Course_o.jpg";
	
	imgTV = new Image();
	imgTV.src = "/images/menu/TV.jpg";
	imgTV_o = new Image();
	imgTV_o.src = "/images/menu/TV_o.jpg";	
	
	imgFeatures = new Image();
	imgFeatures.src = "/images/menu/Features.jpg";
	imgFeatures_o = new Image();
	imgFeatures_o.src = "/images/menu/Features_o.jpg";
	
	imgResources = new Image();
	imgResources.src = "/images/menu/Resources.jpg";
	imgResources_o = new Image();
	imgResources_o.src = "/images/menu/Resources_o.jpg";	
	
	imgCareers = new Image();
	imgCareers.src = "/images/menu/Careers.jpg";
	imgCareers_o = new Image();
	imgCareers_o.src = "/images/menu/Careers_o.jpg";
	
	imgInstructors = new Image();
	imgInstructors.src = "/images/menu/Instructors.jpg";
	imgInstructors_o = new Image();
	imgInstructors_o.src = "/images/menu/Instructors_o.jpg";	
}

// swap cached images
function swap(x, y) {
	if( compat ) {
		document.images[x].src=eval(y+'.src');
	}
}