//==============================================================================
function setRandomBackground(){
    var backImgs = new Array();

    backImgs[0]  = "BGOS.jpg";
    backImgs[1]  = "environment.jpg";
    backImgs[2]  = "facilities.jpg";
    backImgs[3]  = "Fellows.jpg";
    backImgs[4]  = "flag.jpg";
    backImgs[5]  = "graduates.jpg";
    backImgs[6]  = "unilodge.jpg";
    backImgs[7]  = "CNMA.jpg";
    backImgs[8]  = "concerts.jpg";
    backImgs[9]  = "ECS.jpg";
    backImgs[10] = "kioloa.jpg";
    backImgs[11] = "sculpture.jpg";
    backImgs[12] = "questacon.jpg";

    var imgIndex = parseInt((Math.random()*10*backImgs.length)%backImgs.length, 10);
    var imgURL = "url(_images/rotating/" + backImgs[imgIndex] + ")";
    var objContentCell = document.getElementById('contentCell');
    objContentCell.style.backgroundImage = imgURL;
}//setRandomBackground
//==============================================================================

//==============================================================================
// globals for menus
var currSubMenuDiv = null;
var currMenuDiv = null;
var currTopDiv = null;

//==============================================================================
function showSubMenu(menuID){
    hideSubMenu();

    var objSubMenuDiv = document.getElementById('SM'+menuID);
    var objMenuDiv = document.getElementById(menuID);
    var objTopDiv = document.getElementById(menuID-1);

    if( objSubMenuDiv != null ){
        currSubMenuDiv = objSubMenuDiv;
        currMenuDiv = objMenuDiv;
        currTopDiv = objTopDiv;

        if( objSubMenuDiv.filters ){
            objSubMenuDiv.style.padding = "0px 1px 1px 0px";
            objSubMenuDiv.style.background = "#BBBBBB";
        }

        objSubMenuDiv.style.marginTop = objMenuDiv.offsetTop-1;
        objSubMenuDiv.style.display = "block";
        objMenuDiv.style.marginRight = "0px";
        objTopDiv.style.marginRight = "0px";
        objTopDiv.style.backgroundColor = "transparent";
    }
}//showSubMenu
//==============================================================================

//==============================================================================
function hideSubMenu(){
    if( currSubMenuDiv != null ){
        currSubMenuDiv.style.display = "none";
        currMenuDiv.style.marginRight = "16px";
        currTopDiv.style.marginRight = "16px";
        currTopDiv.style.backgroundColor = "#FFFFFF";
    }
}//hideSubMenu
//==============================================================================

//==============================================================================
function setPic(imgID, imgPic){
    var objImg = document.getElementById(imgID);
    objImg.src = "_images/" + imgPic;
}//setPic
//==============================================================================