inline javascript to hide by id code example

Example 1: display none js

document.getElementById("myDIV").style.display = "none";

Example 2: js hide div

//If you have jquery, you can use the following method:
$("#mydiv").hide(); //hides div.
$("#mydiv").show(); //shows div.
//If you don't have jquery...
//search up the following: html how to add jquery