var baseURL = "http://www.foregolfdiscount.com/";
var img = null;
var opacity = 10;


function setImage(src){
    img = baseURL+src;
    darken();
}

function darken(){
    var mainImg = document.getElementById("imgindex");
    if (mainImg.src != img){
        if(opacity > 0){
            opacity = opacity - 1;
            mainImg.style.filter = 'alpha(opacity = ' + opacity * 10 + ')';
            mainImg.style.opacity = opacity/10;
            setTimeout(darken,20);
        }else{
            brighten();
        }
    }
}

function brighten(){
    var mainImg = document.getElementById("imgindex");
    mainImg.src = img;    
    if(opacity < 10){
        opacity = opacity + 1;
        mainImg.style.filter = 'alpha(opacity = ' + opacity * 10 + ')';
        mainImg.style.opacity = opacity/10;
        setTimeout(brighten,20);
    }    
}