// JScript 文件
function expandCollapse(obj,boardId)
{
    var board=document.getElementById(boardId);
    var imgOpen=new Image();
    imgOpen.src="/page/bbs/images/plus.gif";
    var imgClose=new Image();
    imgClose.src="/page/bbs/images/minus.gif";
    if(obj.src==imgOpen.src)
        obj.src=imgClose.src;
    else
        obj.src=imgOpen.src;
    if(board==null) return;
    if(board.style.display=="none")
        board.style.display=""
    else
        board.style.display="none"
}