function preload(s) {
    var d=document;
    d.m01_a=new Image();
    d.m02_a=new Image();
    d.m03_a=new Image();
    d.m04_a=new Image();
    d.m05_a=new Image();
    d.m06_a=new Image();
    d.m07_a=new Image();
    d.m08_a=new Image();
    d.m09_a=new Image();
    d.m10_a=new Image();
    d.m11_a=new Image();

    if(s == 1) {
        d.m01_a.src='../images/m01a.gif';
        d.m02_a.src='../images/m02a.gif';
        d.m03_a.src='../images/m03a.gif';
        d.m04_a.src='../images/m04a.gif';
        d.m05_a.src='../images/m05a.gif';
        d.m06_a.src='../images/m06a.gif';
        d.m07_a.src='../images/m07a.gif';
        d.m08_a.src='../images/m08a.gif';
        d.m09_a.src='../images/m09a.gif';
        d.m10_a.src='../images/m10a.gif';
        d.m11_a.src='../images/m11a.gif';
    } else {
        d.m01_a.src='images/m01a.gif';
        d.m02_a.src='images/m02a.gif';
        d.m03_a.src='images/m03a.gif';
        d.m04_a.src='images/m04a.gif';
        d.m05_a.src='images/m05a.gif';
        d.m06_a.src='images/m06a.gif';
        d.m07_a.src='images/m07a.gif';
        d.m08_a.src='images/m08a.gif';
        d.m09_a.src='images/m09a.gif';
        d.m10_a.src='images/m10a.gif';
        d.m11_a.src='images/m11a.gif';
    }
    flag = true;
}