function arrange() {
    var obj = window;
    if( window.opera ) {
        var w = obj.innerWidth;
        var h = obj.innerHeight;
        var main_t = 141;
    } else if( document.all ){                //ie4-
        var w = obj.document.body.clientWidth;
        var h = obj.document.body.clientHeight;
        var main_t = 144;
   } else if( document.getElementById ){    //n6-7, m1, s1
        var w = obj.innerWidth;
        var h = obj.innerHeight;
        var main_t = 141;
    }

    var head_style = document.getElementById("head").style;
    head_style.left = (w - 850)/2 + "px";
    head_style.top = 0 + "px";
    head_style.width = 850 + "px";
    head_style.height = 100 + "px";
    var main_style = document.getElementById("main").style;
    main_style.left = (w - 850)/2 + "px";
    main_style.top =main_t + "px";
    main_style.width = (850 + (w - 850)/2) + "px";
    main_style.height = ( h - main_t ) + "px";
}