function VBReplaceImage(IdPrefix, Num, TotalNum)
{
    for (var i=1; i<=TotalNum; i++)
    {
        document.getElementById(IdPrefix+''+i).className = 'hide';
    }
    document.getElementById(IdPrefix+''+Num).className = '';   
}


function VBReplaceImage2(MyId,MyImg)
{
    if ((MyId)&&(document.getElementById(MyId)))
    {
        document.getElementById(MyId).src = MyImg;
    }
}