function ImgShw(src, width, height, alt)
{
        var scroll = "no";
        var top=0, left=0;
        if(width > screen.width-10 || height > screen.height-28) scroll = "yes";
        if(height < screen.height-28) top = Math.floor((screen.height - height)/2-14);
        if(width < screen.width-10) left = Math.floor((screen.width - width)/2-5);
        width = Math.min(width, screen.width-10);
        height = Math.min(height, screen.height-28);
        var wnd = window.open("","","scrollbars="+scroll+",resizable=yes,width="+width+",height="+height+",left="+left+",top="+top);
        var doc = wnd.document;
        var body = doc.getElementsByTagName('body')[0];
        body.style.margin=0;
        body.style.marginWidth=0;
        body.style.marginHeight=0;

        var img = doc.createElement('img');
        img.setAttribute('src', src);
        img.width = width;
        img.height = height;
        img.alt = alt;
        img.style.cursor = 'pointer';

        img.onclick = function() { wnd.close() };

        body.appendChild(img);

        return false;
}