按钮的：
<input type="button" onClick="javascript:history.go(-1)" value="back">
超链接的：
<a href="javascript:history.go(-1)">back</a>
<input type="button" onClick="javascript:history.go(-1)" value="back">
超链接的：
<a href="javascript:history.go(-1)">back</a>
<HEAD>
<META NAME="save" CONTENT="history">
<STYLE>
.saveHistory {behavior:url(#default#savehistory);}
</STYLE>
</HEAD>
<BODY>
<FORM>
<INPUT class=saveHistory>
<INPUT class=saveHistory>
<INPUT class=saveHistory>
</FORM>
</BODY>
</HTML>