function checkWidth(){
if(screen.width <= 800)
    document.all.divTimeline.style.pixelLeft = 150;
}

function tl_switchHTML(nIndex)
{
    if ((navigator.appName=="Netscape" && parseInt(navigator.appVersion) <=4))
    {
        x = document.layers['divTimeline'];
        x.document.open();
        x.document.write(tl_aInnerHTML[nIndex]);
        x.document.close();
    }
    else
    {
        document.getElementById("divTimeline").innerHTML = tl_aInnerHTML[nIndex];
    }
}

function changePic(imageNumber){
    buttonImgNum = imageNumber;
    tl_switchHTML(buttonImgNum);
}

function nextPic(){
    buttonImgNum += 1;
    if(buttonImgNum < tl_aInnerHTML.length && buttonImgNum >= 0){
        tl_switchHTML(buttonImgNum);
    } else {
        alert('You have reached the end of the image gallery.');
        buttonImgNum = tl_aInnerHTML.length -1;
    }
}

function prevPic(){
    buttonImgNum -= 1;
    if(buttonImgNum >= 0 && buttonImgNum < tl_aInnerHTML.length){
        tl_switchHTML(buttonImgNum);
    } else {
        alert('You have reached the beginning of the image gallery.');
        buttonImgNum = 0;
    }
}

function nextPicFr(){
    buttonImgNum += 1;
    if(buttonImgNum < tl_aInnerHTML.length && buttonImgNum >= 0){
        tl_switchHTML(buttonImgNum);
    } else {
        alert('Vous êtes arrivés à la fin de la galerie d’images.');
        buttonImgNum = tl_aInnerHTML.length -1;
    }
}

function prevPicFr(){
    buttonImgNum -= 1;
    if(buttonImgNum >= 0 && buttonImgNum < tl_aInnerHTML.length){
        tl_switchHTML(buttonImgNum);
    } else {
        alert('Vous êtes arrivés à la fin de la galerie d\'images.');
        buttonImgNum = 0;
    }
}