function ImageHover(img)
{
    var source = img.src;
    
    if(source.indexOf("-off") > -1)
    {
        img.src = source.replace("-off","-on");
    }
    else
    {
        img.src = source.replace("-on","-off");
    }

}

function checkUncheckAll(box,field)
{
    if (box.checked == true)
    {
        for (i = 0; i < field.length; i++)
            field[i].checked = true ;
    }
    else
    {
        for (i = 0; i < field.length; i++)
            field[i].checked = false ;
    }
}

// Sets the src attribute of the image object passed.
function SwapNavImage(obj, Image)
{
    
    obj.src = Image;
}