IE8: Background image does not show on multiple lines text

I only saw this issue in IE. Firefox was fine.

A multiple line text, which css has a background image, the image does not show in IE8.

css is like this

.successArea { 
    font-size:14px; 
    font-weight:bold; 
    padding-left:35px; 
    padding-top:20px; 
    color:#66CC00; 
    background-image:url(../images/icon_success.gif); 
    background-position: 15px 20px; 
    background-repeat:no-repeat;    
    position : relative; 
}

To fix it, add this in css

zoom : 1;