有人可以帮我删除这个“加号”图像的边框吗?
<div id="Drop Image and Advance Search" style="margin-left: 0px">
<img id='downarrow' style='float: left;'
border=none src=".\images\button_plus.gif"
width="20" height="20"
onclick="javascript:toggle();">
<img id='uparrow'
style='display: none; float: left;'
border=none src=".\images\button_minus.gif"
width="20" height="20"
onclick="javascript:toggle();">
<a href="javascript:toggle();"> <u><h4>Advance Search</h4></u></a>
</div>