var contentItems = [];
var contentIndex = 0;

function nextDocument() {
    if( contentIndex < contentItems.length -1 ) {
        contentIndex++;    
        loadContentItem( contentItems[contentIndex] );
    }
};


function loadContentItem( iItemId ) {
    var sURL = "retrievecontent.cfm?curl=1,0," + iItemId + ",1";
    Spry.Utils.loadURL( "GET", sURL, true, updateContent );
    updateNavigationControls();
};

function updateContent( oReq ) {
    Spry.Utils.setInnerHTML( "display", oReq.xhRequest.responseText );
};

function updateNavigationControls() {
    var oPrev = document.getElementById( "content-navigation-prev" );
    var oNext = document.getElementById( "content-navigation-next" );
    if( contentIndex > 0 ) {
        // turn on previous
        oPrev.src = contentNavPrevEnabledSRC;
    } else {
        // turn off previous
        oPrev.src = contentNavPrevDisabledSRC;
    }
    if( contentIndex < contentItems.length - 1 ) {
        // turn on next
        oNext.src = contentNavNextEnabledSRC;
    } else {
        // turn off next
        oNext.src = contentNavNextDisabledSRC;
    }
}


function previousDocument() {
    if( contentIndex > 0 ) {
        contentIndex--;
        loadContentItem( contentItems[contentIndex] );
    }
};

function initializeModule99() {
    if( contentItems.length > 1 ) {
        updateNavigationControls();
        var oContentNavigation = document.getElementById( "content-navigation");
        if( oContentNavigation ) {
            oContentNavigation.style.visibility = "visible";
        }
    }
};