只显示下边框的Text.(

<iframe name="google_ads_frame" marginwidth="0" marginheight="0" src="http://googleads.g.doubleclick.net/pagead/ads?client=ca-pub-4490194096475053&amp;dt=1228549527546&amp;lmt=1228528454&amp;prev_slotnames=1891601125&amp;output=html&amp;slotname=3685991503&amp;correlator=1228549527484&amp;url=http%3A%2F%2Fwww.corange.cn%2Farchives%2F2008%2F10%2F1827.html&amp;ea=0&amp;ref=http%3A%2F%2Fwww.corange.cn%2Fhtml%2Fcorange__97.html&amp;frm=0&amp;ga_vid=1156723026.1228549528&amp;ga_sid=1228549528&amp;ga_hid=621711762&amp;flash=9.0.124.0&amp;u_h=768&amp;u_w=1024&amp;u_ah=738&amp;u_aw=1024&amp;u_cd=32&amp;u_tz=480&amp;u_java=true&amp;dtd=16" frameborder="0" width="300" scrolling="no" height="250" allowtransparency></iframe>
原理可以是隐藏其他3个方向的边框:

<DIV align=center >
只有下边框:<INPUT style="BORDER-RIGHT: medium none; BORDER-TOP: medium none; BORDER-LEFT: medium none; COLOR: rgb(255,0,0); BORDER-BOTTOM: rgb(192,192,192) 1px solid" name=answer>
</DIV>

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