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<html>
<head>
<meta charset=utf-8 />
<title>JS test</title>

</head>
<body>
<input type="text" id="Y" size="20" style="position: absolute; left: 100; top: 100">
<input type="button" value="A1" name="B3" onclick="a1()">
<input type="button" value="A2" name="B3" onclick="a2()">
<input type="button" value="A3" name="B3" onclick="a3()">
<script>
window.fy=document.getElementById('Y');
function a1(){
        fy.value=1;
}

function a2(){
        fy.style.left=0;
}

function a3(){
        fy.style.top=0;
}
</script>
</body>
</html>