var activeMenu = false;
var timeCounter = false;

function showDropDown(ddMenuID, navImgID) {
    if (document.getElementById) {
        obj = document.getElementById(ddMenuID);
        if (activeMenu) {
            hideDropDown();
        }
        if (!obj) {
            return;
        }
        activeMenu = ddMenuID;
        obj.style.visibility = 'visible';
    }
}

function enterDropDown() {
    clearTimeout(timeCounter);
}

function leaveDropDown() {
    if (timeCounter) {
        clearTimeout(timeCounter);
    }
    timeCounter = setTimeout("hideDropDown()", 1500);
}
function leaveButton() {
    if (activeMenu) {
        if (timeCounter) {
            clearTimeout(timeCounter);
        }
        timeCounter = setTimeout("hideDropDown()", 1500);
    }
}

function hideDropDown() {
    if (document.getElementById) {
        if (activeMenu) {
            document.getElementById(activeMenu).style.visibility = 'hidden';
            activeMenu = false;
        }
        if (timeCounter) {
            clearTimeout(timeCounter);
        }
    }
}