js如何取得另一网页传来的参数，并在网页上显示，帮忙！送分！

1.html<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<script>
function OpenChildWin()
{
  window.SendParam = "这是父网页传来的文本";
  window.open("2.html");
}
</script><BODY>
<input type="button" value="OpenChildWin" onclick="OpenChildWin()">
</BODY>
</HTML>2.html<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD><BODY onload="document.body.innerHTML = opener.SendParam;"></BODY>
</HTML>