extjs button自定义样式在ie中无法启用的问题

比如cls，overCls等，只需要在css每一个属性最后加入“!important”即可。例如

.head_input_inputover{ 
	border:0px!important; 
	border:none!important; 
	width:120px!important; 
	height:60px!important; 
	background:url("../images/btn_switch_hover.png") no-repeat left top transparent !important; 
	padding:0px!important; 
	cursor: pointer!important; 
	float:right!important; 
	margin-top:14px!important; 
	margin-right:30px!important;
	overflow:visible!important; 
}