function list_mid(){
    document.writeln("<p align='center'>");
        document.writeln("</p>");
}
function list_bot(){
    document.writeln("<p align='center'>");
        document.writeln("</p>");
}

function read1(){}
function read2(){
    document.writeln("<div style='margin:10px auto;width: 930px;height: 250px;'>");
    document.writeln("<span style='float:left;margin:0 5px'>");
        document.writeln("</span>");
    document.writeln("<span style='float:left;margin:0 5px'>");
        document.writeln("</span>");
    document.writeln("<span style='float:left;margin:0 5px'>");
        document.writeln("</span>");
    document.writeln("</div>");
}
function read3(){
    }
function read4(){
    document.writeln("<p align='center'>");
        document.writeln("</p>");
}
function readtc(){
}

function showads(adid) {
    if (adid == 'pagetopad1') {
        read2();
    }
    else if (adid == 'pagetxtad1') {
        read3();
    }
    else if (adid == 'pagebottomad1') {
        read4();
    }
}