function tieudiem1(){
window.open("../courses/course1.html", "Test", "width=950,height=600,status=1,toolbar=0, location=0, scrollbars=yes");
}
function tieudiem2(){
window.open("../courses/course2.html", "Test", "width=950,height=600,status=1,toolbar=0, location=0, scrollbars=yes");
}
function tieudiem3(){
window.open("../courses/course3.html", "Test", "width=950,height=600,status=1,toolbar=0, location=0, scrollbars=yes");
}
function tieudiem4(){
window.open("../courses/course4.html", "Test", "width=950,height=600,status=1,toolbar=0, location=0, scrollbars=yes");
}
function tieudiem5(){
window.open("../courses/course5.html", "Test", "width=950,height=600,status=1,toolbar=0, location=0, scrollbars=yes");
}
function tieudiem6(){
window.open("../courses/course6.html", "Test", "width=950,height=600,status=1,toolbar=0, location=0, scrollbars=yes");
}