function OpenWin1(){
    win1=window.open("topics/w_classroom.html","new1","scrollbars=yes,width=420,height=400");
}

function OpenWin2(){
    win1=window.open("topics/kyuuka.html","new1","scrollbars=yes,width=420,height=400");
}

function OpenWin3(){
    win1=window.open("topics/olympics.html","new1","scrollbars=yes,width=420,height=400");
}

function OpenWin4(){
    win1=window.open("topics/kakikyuu.html","new1","scrollbars=yes,width=420,height=400");
}

function OpenWin5(){
    win1=window.open("topics/joykurihara.html","new1","scrollbars=yes,width=420,height=400");
}