function swapImg(img, path, name ) {
	img.src = path +  name;
};

function getMenuImg(name) {
    var img_id= "menu_"+name;
    return document.getElementById(img_id);
}
function onHover (name) {
    var imgD= getMenuImg(name)
    var newPath = image_path;
	var newName = name+'_over'+'.'+image_file_ext;
	swapImg (imgD, newPath, newName);
};

function onOut (name) {
    var imgD= getMenuImg(name)
	var newPath = image_path;
	var newName = name+'_off'+'.'+image_file_ext;
	swapImg (imgD, newPath, newName);
}

function onClick (name) {
    var imgD= getMenuImg(name)
	var newPath = image_path;
	var newName = name+'_on'+'.'+image_file_ext;
	swapImg (imgD, newPath, newName);
    return true;
}