function hideArrows()
{
    document.getElementById( 'downArrow1' ).style.display = 'none';
    document.getElementById( 'downArrow2' ).style.display = 'none';
    document.getElementById( 'downArrow3' ).style.display = 'none';
    document.getElementById( 'downArrow4' ).style.display = 'none';
    document.getElementById( 'downArrow5' ).style.display = 'none';
}

function getImage( existingImageId, imageUrl, downArrowId )
{
    document.getElementById( 'tdProgress' ).style.display = '';
    var img = document.createElement( 'img' );
    
    img.onload = function( evt ) 
    {
        document.getElementById( existingImageId ).src = img.src;
        document.getElementById( existingImageId ).width = img.width;
        document.getElementById( existingImageId ).height = img.height;
        
        hideArrows();
        document.getElementById( downArrowId ).style.display = '';
        
        document.getElementById( 'tdProgress' ).style.display = 'none';
    }
    
    img.src = imageUrl;
}