function DrawImage(ImgD,imgw,imgh)
{ 
    var image=new Image();
    image.src=ImgD.src;     
    if(image.width>0 && image.height>0)
    { 
        flag=true; 
        if(image.width/image.height>= imgw/imgh)
        {
            if(image.width>imgw)
            {
                ImgD.width=imgw; 
                ImgD.height=(image.height*imgw)/image.width; 
            }
            else
            {
                ImgD.width=image.width;
                ImgD.height=image.height;
            }
        } 
        else
        { 
            if(image.height>imgh)
            { 
                ImgD.height=imgh;
                ImgD.width=(image.width*imgh)/image.height; 
            }
            else
            {
                ImgD.width=image.width;
                ImgD.height=image.height;
            }
        } 
    }
}