function get_width(){
    var main, header, center;
    if(document.body.clientWidth < 1000) main="1000px";
    else if(document.body.clientWidth > 1280) main="1280px";
    else main="auto";
    if(document.body.clientWidth < 1000) header="1000px";
    else if(document.body.clientWidth > 1280) header="1280px";
    else header="auto";
    if(document.body.clientWidth < 1000) center="395px";
    else if(document.body.clientWidth > 1280) center="675px";
    else center="auto";
    document.write('<style>#main{ _width: '+main+'; } #header-owner{ _width: '+header+'; } #center #center-owner{ _width: '+center+'; }</style>');
}