function DrawImage(ImgDraw,Iwidth,Iheight)
{
    var width=ImgDraw.width;
    var height=ImgDraw.height;
    if(width>0 && height>0)
    {
        if(width/height> Iwidth/Iheight)
        {
            if(width>Iwidth)
            { 
                ImgDraw.width=Iwidth;
                ImgDraw.height=(height*Iwidth)/width;
            }
            else
            {
                ImgDraw.width=width; 
                ImgDraw.height=height;
            }   
        }
        else
        {
            if(height>Iheight)
            { 
                ImgDraw.height=Iheight;
                ImgDraw.width=(width*Iheight)/height; 
            }
            else
            {
                ImgDraw.width=width; 
                ImgDraw.height=height;
            }
        }
    }
}