function newImage(strSrc){
    
    var oImg = new Image();
    oImg.src = strSrc;
    return oImg;
    
}

var i_on  = newImage('images/menu/home/i_on.gif');
var i_off = newImage('images/menu/home/i.gif');
var n_on  = newImage('images/menu/home/n_on.gif');
var n_off = newImage('images/menu/home/n.gif');
var p_on  = newImage('images/menu/home/p_on.gif');
var p_off = newImage('images/menu/home/p.gif');
var r_on  = newImage('images/menu/home/r_on.gif');
var r_off = newImage('images/menu/home/r.gif');
var c_on  = newImage('images/menu/home/c_on.gif');
var c_off = newImage('images/menu/home/c.gif');

function home(nm, status){
    
    if(document.images[nm]){
        document.images[nm].src = eval(nm + '_' + status + '.src');
    }
    
}