meniu_1on = new Image();     
meniu_1on.src = "img/top2_02.gif";
meniu_2on = new Image();     
meniu_2on.src = "img/top2_03.gif";
meniu_3on = new Image();     
meniu_3on.src = "img/top2_04.gif";
meniu_4on = new Image();     
meniu_4on.src = "img/top2_05.gif";

meniu_1off = new Image();     
meniu_1off.src = "img/top1_02.gif";
meniu_2off = new Image();     
meniu_2off.src = "img/top1_03.gif";
meniu_3off = new Image();     
meniu_3off.src = "img/top1_04.gif";
meniu_4off = new Image();     
meniu_4off.src = "img/top1_05.gif";

function img_act(imgName) {
        imgOn = eval(imgName + "on.src");
        document [imgName].src = imgOn;
}

function img_inact(imgName) {
        imgOff = eval(imgName + "off.src");
        document [imgName].src = imgOff;
}