<%@ Control Language="C#" AutoEventWireup="true" CodeFile="Head.ascx.cs" Inherits="Controls_Head" %>
<div class="aaa">
头部DIV
</div>

------解决方案--------------------
请参考下边代码:
HTML code

<style>
.btn {
BORDER-RIGHT: #7b9ebd 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #7b9ebd 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 12px; FILTER: progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColorStr=#ffffff, EndColorStr=#cecfde); BORDER-LEFT: #7b9ebd 1px solid; CURSOR: hand; COLOR: black; PADDING-TOP: 2px; BORDER-BOTTOM: #7b9ebd 1px solid
}
.btn1_mouseout {
BORDER-RIGHT: #7EBF4F 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #7EBF4F 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 12px; FILTER: progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColorStr=#ffffff, EndColorStr=#B3D997); BORDER-LEFT: #7EBF4F 1px solid; CURSOR: hand; COLOR: black; PADDING-TOP: 2px; BORDER-BOTTOM: #7EBF4F 1px solid
}
.btn1_mouseover {
BORDER-RIGHT: #7EBF4F 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #7EBF4F 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 12px; FILTER: progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColorStr=#ffffff, EndColorStr=#CAE4B6); BORDER-LEFT: #7EBF4F 1px solid; CURSOR: hand; COLOR: black; PADDING-TOP: 2px; BORDER-BOTTOM: #7EBF4F 1px solid
}
</style>

<button class=btn1_mouseout onmouseover="this.className='btn1_mouseover'"
onmouseout="this.className='btn1_mouseout'" title="网页设计秀:http://www.cnwebshow.com" > 网页设计秀</button>