var a = document.getElementsByTagName("INPUT");
for(var i=0; i<a.length; i++)
{
if(a[i].type=="button") a[i].disabled = true;
}
for(var i=0; i<a.length; i++)
{
if(a[i].type=="button") a[i].disabled = true;
}
<html>
<head>
</head>
<body>
<input type="button" name="aa" value="aa" onclick="disButton(this)">
<input type="button" name="bb" value="bb" onclick="disButton(this)">
<input type="button" name="cc" value="cc" onclick="disButton(this)">
<input type="button" name="cc" value="cc" onclick="disButton(this)">
<input type="button" name="cc" value="cc" onclick="disButton(this)">
<script language="javascript">
function disButton(obj)
{
var a = document.getElementsByTagName("INPUT");
for(var i=0; i<a.length; i++)
{
if(a[i].type=="button" && a[i]!=obj )
a[i].disabled = true;
}
}
</script>
</body>
</html>
function disButton(obj)
{
var a = document.getElementsByTagName("INPUT");
for(var i=0; i<a.length; i++)
if(a[i].type=="button") a[i].disabled = true;
obj.disabled = false;
}