<script>
        $(document).ready(function{
            $("#first").click(function{
                $("#second").css("display", "none");
            })
        })
    </script>




<div id="first"></div>
<div id="second"></div>


	<style>
        #first{
            width: 200px;
            height: 200px;
            background: red;
        }

        #second{
            width: 200px;
            height: 200px;
            background: blue;
        }
    </style>