IE nepracuje FF ano

<span style="position: relative;
top: 0px;left: -10px">
<a href="někam1.html"
onmouseover="document['obrazek'].src = 'tl2b.jpg' 
;"onmouseout="document['obrazek'].src = 'tl2a.jpg' ;">
<img src="tl2a.jpg" name="obrazek" border="0" 
onfocus="this.blur()"></span><span style="position: 
relative; top: 80px; left: -250px;font-size: 60; 
text-decoration: none;" class=tl>VSTUP</span></a>

}

td.tl {
    text-align : center;
    text-decoration: none;
}
.tl a {
    color: silver;
    text-decoration: none;
    text-align: center;


}
.tl a:hover {
    color: white;
    text-decoration: underline;

}