<script>
function a(){
a=window.open("index.htm","win","")
}
</script>
<body onload=a()>
<input type=button onclick=a.focus()>
function a(){
a=window.open("index.htm","win","")
}
</script>
<body onload=a()>
<input type=button onclick=a.focus()>
2.<input type="button" onclick="location.replace('in.htm')" value="Open"/>