// JScript 文件
//图片按比例缩放

function DrawImage(ImgID,striwidth,striheight,LoadingID,LoadedID)
{
    ImgD=(document.getElementById(ImgID)==null?ImgID:document.getElementById(ImgID));
    var image=new Image();
    var iwidth = (typeof(striwidth)=="undefined"?120:striwidth); //定义允许图片宽度
    var iheight = (typeof(striheight)=="undefined" ?120:striheight); //定义允许图片高度
    image.src=ImgD.src;
    if(image.width>0 && image.height>0)
    {
        if(image.width/image.height>= iwidth/iheight)
        {
            if(image.width>iwidth)
            {
                ImgD.width=iwidth;
                ImgD.height=(image.height*iwidth)/image.width;
            }
            else
            {
                ImgD.width=image.width;
                ImgD.height=image.height;
            }
            ImgD.alt=image.width+"×"+image.height;
        }
        else
        {
            if(image.height>iheight)
            {
                ImgD.height=iheight;
                ImgD.width=(image.width*iheight)/image.height;
            }
            else
            {
                ImgD.width=image.width;
                ImgD.height=image.height;
            }
            ImgD.alt=image.width+"×"+image.height;
        }
    }
    var Loading=(document.getElementById(LoadingID)==null?"":document.getElementById(LoadingID))
    var Loaded=(document.getElementById(LoadedID)==null?"":document.getElementById(LoadedID))
    if(Loading!="" && Loaded!="")
    {
        Loading.style.display="none";
        Loaded.style.display="block";
    }
}