同样的页面在IE和firefox下面怎么出现两个不同的效果？页面代码非常简单不知道什么

代码如下：
<!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><FRAMESET ROWS="300,300,*" COLS=",">
<FRAME SRC="https://www.paypal.com/cart/add=1&[email protected]&item_name=%22It+is+Five+in+the+Morning%22&item_number=Image009&amount=775.00" NAME="">
<FRAME SRC="https://www.paypal.com/cart/add=1&business=gallery%40petergallery.com&item_name=%22It+is+Five+in+the+Morning%22&item_number=Image009&amount=775.00" NAME="">
</FRAMESET>
<BODY></BODY>
</HTML>