var flag = false;

function imageLoad() {  
    if (document.images) {
        img1on = new Image(); img1on.src = "pix/h/01_b.png";
        img2on = new Image(); img2on.src = "pix/h/02_b.png";
        img3on = new Image(); img3on.src = "pix/h/03_b.png";
        img4on = new Image(); img4on.src = "pix/h/04_b.png";
        img5on = new Image(); img5on.src = "pix/m/05_b.png"; 
        return (flag = true);  
    }
}

if (document.images) {   
    img1off = new Image(); img1off.src = "pix/h/01.png";
    img2off = new Image(); img2off.src = "pix/h/02.png";
    img3off = new Image(); img3off.src = "pix/h/03.png";
    img4off = new Image(); img4off.src = "pix/h/04.png";
    img5off = new Image(); img5off.src = "pix/h/05.png";
}


function rollIn(imgName) {
    if (document.images && (flag == true)) {
        document[imgName].src = eval(imgName + "on.src");
    }
}

function rollOut(imgName) { 
    if (document.images){
        document[imgName].src = eval(imgName + "off.src");
    }
}