Resize window caused dynamic layers disappear if the map with Base layers in Chrome/Safari

[yangte]

Steps:

1. Create one map and add one dynamic layer
2. Add one base layer group with base layer(important)
3. New basic web layout with the new map.
4. Open the web layout in Chrome/Safari.
5. Resize the window

Results: Only base layers will be shown in the map.

[yangte]

When the map has base layer group, the ajaxviewer will hide the dynamic map image div first.

function HideMapImage()
{
    if(!HasVisibleBaseGroups())
        return;
    document.getElementById("img1").style.display = "none";
}

In the code for IE/Firefox, the Ajax viewer will unhide the map image div:

function OnMapOverlayImageLoaded(e)
{
...
var imgdiv = document.getElementById("img1");
...
    {
        img.src = overlayimg.src;
        img.style.position = "absolute";
        img.style.visibility = "visible";
        img.style.width = mapDevW;
        img.style.height = mapDevH;
        img.style.left = 0;
        img.style.top = 0;
    }
    imgdiv.style.display = "block";
...
}

However, in the code for Chrome/Safari, someone forgot to unhide the map image div:

function OnAlternateImageLoaded()
{
...	
    // Show the newly loaded image
    img.style.position = "absolute";
    img.style.visibility = "visible";
    img.style.width = mapDevW;
    img.style.height = mapDevH;
    img.style.left = 0;
    img.style.top = 0;
 ...
}

so the solution is to simply unhide the div.

[liuar]

The patch looks good to me. I've submitted the code. Changeset [5325] by liuar