function allcheck1(){ var check2 = document.getElementById("all1") var arr2 = document.getElementsByClassName("study") for(var i2 in arr2){ var c2 = arr2[i2] c2.checked = check2.checked; } } function allcheck2(check3){ var arr3 = document.getElementsByClassName("study") for(var i3 in arr3){ var c3 = arr3[i3] c3.checked = check3.checked; } } //ChangeImage function CountWord(){ var str = document...