function confirmDelete() {
    if (confirm("Are you sure you want to proceed?")) {
        return true;
    } else {
        return false;
    }
}

function ViewImg(eventId, fileIndex, fileArray) {

    //fade in new image
    var element = document.getElementById('ctl00_ContentPlaceHolder1_imgGalleryMain');
    if (element.filters) {
        element.style.filter = "blendTrans(duration=1)";
        element.filters.blendTrans.Apply();
    }
    element.src = "/content/events/" + eventId.toString() + "/images/" + fileArray[fileIndex];
    if (element.filters) element.filters.blendTrans.Play();

    //set prev and next buttons
    var btnPrev = document.getElementById('ctl00_ContentPlaceHolder1_galleryPrev');
    var btnNext = document.getElementById('ctl00_ContentPlaceHolder1_galleryNext');

    var prevImgIndex = parseInt(fileIndex) - 1;
    var nextImgIndex = parseInt(fileIndex) + 1;
    var imgArray = '';
    for (var i = 0; i < fileArray.length; i++) {
        imgArray += fileArray[i] + "','";
    }

    imgArray = imgArray.substring(0, imgArray.length - 3);

    btnPrev.setAttribute("onClick", "ViewImg('" + eventId.toString() + "','" + prevImgIndex.toString() + "',new Array('" + imgArray + "'));");
    btnNext.setAttribute("onClick", "ViewImg('" + eventId.toString() + "','" + nextImgIndex.toString() + "',new Array('" + imgArray + "'));");

    //if not first image set prev tab visible
    if (parseInt(fileIndex) == 0) {
        btnPrev.style.display = "none";
    }
    else {
        btnPrev.style.display = "block";
    }

    //if last image remove next tab
    if (parseInt(fileIndex) == parseInt(fileArray.length) - 1) {
        btnNext.style.display = "none";
    }
    else {
        btnNext.style.display = "block";
    }
}