#obal {
 width: 980px; /*šírka layoutu*/
 text-align: left; /*zrušenie vycentrovania textu*/
 margin: 0 auto; /*vycentrovanie v ostatných prehliadacoch*/
 border: 0px solid silver;
}

.hlava {
 width: 980px; 
 background: url(../img/hlavicka.png) no-repeat;
 opacity: 0.9;   
 filter: alpha(opacity=90);   
 -moz-opacity: 0.9;   
 -khtml-opacity: 0.9;   
}

.stred {
 width: 980px; 
 background: #FFFFFF;
 opacity: 0.9;   
 filter: alpha(opacity=90);   
 -moz-opacity: 0.9;   
 -khtml-opacity: 0.9;   
}

.pata {
 text-align: center; 
 height: 100px;
 background: url(../img/paticka.png) no-repeat;
 opacity: 0.9;   
 filter: alpha(opacity=90);   
 -moz-opacity: 0.9;   
 -khtml-opacity: 0.9;   
}

#menu {
 width:270px;
 height: 100px;
 border: 2px solid green;
 display: inline;
 }

#obsah {
 width: 580px; 
 height: 100px;
 text-align: left; 
 border: 2px solid red;
}