// == roll over + preload ===============================

var flag = false;

function imageLoad() {  // called with onLoad()
    if (document.images) {
        img1on = new Image(); img1on.src = "media/images/b_home_on.gif";
        img2on = new Image(); img2on.src = "media/images/b_nieuws_on.gif";
        img3on = new Image(); img3on.src = "media/images/b_salentein_on.gif";
        img4on = new Image(); img4on.src = "media/images/b_menu_on.gif";
        img5on = new Image(); img5on.src = "media/images/b_contact_on.gif";
        img6on = new Image(); img6on.src = "media/images/b_dorsmolen_on.gif";		
        return (flag = true);  // set the flag and let the function know know it can work
    }
}

if (document.images) {   // load the off images in the normal way
    img1off = new Image(); img1off.src = "media/images/b_home_off.gif";
    img2off = new Image(); img2off.src = "media/images/b_nieuws_off.gif";
    img3off = new Image(); img3off.src = "media/images/b_salentein_off.gif";
    img4off = new Image(); img4off.src = "media/images/b_menu_off.gif";
    img5off = new Image(); img5off.src = "media/images/b_contact_off.gif";
    img6off = new Image(); img6off.src = "media/images/b_dorsmolen_off.gif";
}


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

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