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.btn_black a {I've created a Class called "btn_black" for the button. As explained before, the width and height are defined as 100x25. The button is set to "float:left;" I've fond that setting the button to a float state solves cross-browser issues.
width:100px;
height:25px;
float:left;
text-indent:-2000px;
background:url(../images/css_rollover_btn.jpg) 0 0;
}
.btn_black a:hover {
background:url(../images/css_rollover_btn.jpg) 0 -25px;
}
<div class="btn_black"><a href="http://www.blogger.com/index.html" title="black button">HOME</a></div>