var smallIcon = null;
function ShowEventLayer(layerId, thisImage) {
    var eventLayer = document.getElementById(layerId);
        
    eventLayer.style.posLeft = eventLayer.offsetLeft + thisImage.offsetLeft;
    smallIcon = thisImage;

    eventLayer.style.visibility = "visible";
}

function HideEventLayer(layer) {
    v = window.setTimeout(function() { layer.style.visibility = "hidden"; }, 500);
}
function HideEventLayer2(id) {
    var layer = document.getElementById(id);
    v = window.setTimeout(function() { layer.style.visibility = "hidden"; }, 500);
}

function HideOtherLayers(layerId) {
    var va = document.getElementsByTagName("div");
    for (i = 0; i < va.length; i++) {
        var match = /eventLayer/.test(va[i].id);
        if (match) {
            if (va[i] != layerId)
                va[i].style.visibility = "hidden";
        }
    }
}
function Test(layer) {

    if (v != null)
        clearTimeout(v);
    
    layer.style.visibility = "visible";
}



function opacity(id, opacStart, opacEnd, millisec) {
    //speed for each frame
    var speed = Math.round(millisec / 100);
    var timer = 0;

    //determine the direction for the blending, if start and end are the same nothing happens
    if (opacStart > opacEnd) {
        for (i = opacStart; i >= opacEnd; i--) {
            setTimeout("changeOpac(" + i + ",'" + id + "')", (timer * speed));
            timer++;
        }
    } else if (opacStart < opacEnd) {
        for (i = opacStart; i <= opacEnd; i++) {
            setTimeout("changeOpac(" + i + ",'" + id + "')", (timer * speed));
            timer++;
        }
    }
}

//change the opacity for different browsers
function changeOpac(opacity, id) {
    var object = document.getElementById(id).style;
    object.opacity = (opacity / 100);
    object.MozOpacity = (opacity / 100);
    object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
}

function shiftOpacity(id, millisec) {
    //if an element is invisible, make it visible, else make it ivisible
    if (document.getElementById(id).style.opacity == 0) {
        opacity(id, 0, 100, millisec);
    } else {
        opacity(id, 100, 0, millisec);
    }
}