Edit in JSFiddle

Result
HTML
JavaScript

<body>
    <input type="image" src="http://2.bp.blogspot.com/-Jc1K3CHEYLU/URae3WiT4-I/AAAAAAAAAV0/EdcJ_cfh_kE/s1600/jquery1.png" />
    <br />
    <button type="button" id="myButton">Click Me</button>
    <button onclick="location.reload()">Reset</button>
    </body>

$(document).ready(function()
    {
    $("#myButton").click(function()
    {
    $(":image").css("height","20px");
    });
    });