wtab=773 //larghezza tabella

var OPER=navigator.userAgent.indexOf("Opera");
if (document.layers){ //Netscape 4.x 
floatX=(window.innerWidth-wtab-10)/2+618;
} 
else if((OPER>-1)) { //Opera
floatX=(document.body.clientWidth-wtab)/2+618;
} 
else if (document.all){ // Explorer
floatX=(document.body.clientWidth-wtab)/2+618;
}
else if (document.getElementById){ //Netscape 6
floatX=(document.body.clientWidth-wtab)/2+618;
}
if (floatX<=7) floatX=3 //definisce posizione in base a risoluzione

if (NS4) {document.write('<LAYER NAME="floatlayer" LEFT="'+floatX+'" TOP="'+floatY+'">');} 
if ((IE4) || (NS6)) {document.write('<div id="floatlayer" style="position:absolute; left:'+floatX+'; top:'+floatY+';">');}