兼容ie和firefox的鼠标经过(onmouseover和onmouseout)实现

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< html  xmlns ="http://www.w3.org/1999/xhtml" >  
< head >  
< meta  http-equiv ="Content-Type"  content ="text/html; charset=gb2312"   />  
< title >兼容ie和firefox的鼠标经过(onmouseover和onmouseout)实现 </ title >  
< style  type ="text/css" >  
#b_g_date tr {  
  event : expression(
       onmouseover = function(){this.style.backgroundColor='#E3FFC9' } ,
       onmouseout = function() { this.style.backgroundColor='#FFFFFF' } ); 
} 
#b_g_date tr:hover {    background : #E3FFC9 ;   }  
#b_g_date td {    height : 20px ;   }  
</ style >  
</ head >  
< body >  
< table  width ="500"  border ="1"   height ="300"  id ="b_g_date" >  
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</ body >  
</ html >