<a href="#" id="avalue" value="1">avalue</a><br>
<script language="javascript">
function getvalue()
{
alert(document.all("avalue").value);
}
</script>
<button onclick="getvalue()">getvalue</button>
<script language="javascript">
function getvalue()
{
alert(document.all("avalue").value);
}
</script>
<button onclick="getvalue()">getvalue</button>
<script language="javascript">
function getvalue()
{
alert(document.all.avalue.value);
}
</script>
<button onclick="getvalue()">getvalue</button>
<script language="javascript">
function getvalue()
{
alert(document.getElementById("avalue").value);
}
</script>
</head>
<body>
<a href="#" id="avalue" value="1">avalue</a><br>
<button onclick="getvalue()">getvalue</button>
</body>