帮帮忙啊!

可以像这样，给每个frame加个名字
main.htm
<html>
<head><title></title></head><frameset id="cFrame" name="cFrame" rows="*" cols="30%,*" > 
<frame src="left.htm" name="leftFrame" scrolling="auto"> 
<frame src="right.htm" name="rightFrame" scrolling="auto"> 
</frameset> </html>
left.htm
<html>
<head><title></title></head>
<body>
left
</body>
</html>
right.htm
<html>
<head><title></title></head>
<body>
right
<input type='button' value='11111' onclick="parent.leftFrame.location='http://www.baidu.com';   " />
</body>
</html>