<input type=button name=b1 value="open" onclick=zhou()>
<script language=javascript>
<!--function zhou()
{
window.location.replace('2.asp')
}
-->
</script>
<script language=javascript>
<!--function zhou()
{
window.location.replace('2.asp')
}
-->
</script>
<!--
window.open("str.php","_self");
//-->
_self 刷新本窗口,_parent 刷新本窗口的父窗口(框架),_top 刷新最上层窗口(框架)
</SCRIPT>
否则就会打开一个新窗口
至于_self,_parent,_top,_blank只是和与当前窗口相关的窗口对象的引用别名而已,在指定这些特殊名称时,引用特定的窗口
window.open("tt.htm","_self");
</script>