function open_div(){
    sw = screen.width;
    sh = screen.height;
    if (sw > 1024 && sh > 768) {
        document.writeln("<div id='horizon'>");
        document.writeln("<div id='content'>");
        document.writeln("<div>");
        document.writeln("<div>");

    } else {
        document.writeln("<div>");
        document.writeln("<div>");
    }
}

function close_div(){
    document.writeln("</div>");
    document.writeln("</div>");
}