function Is() {
    var agent   = navigator.userAgent.toLowerCase();
    this.major  = parseInt(navigator.appVersion);
    this.minor  = parseFloat(navigator.appVersion);
    this.ns     = ((agent.indexOf('mozilla')   != -1) &&
                  (agent.indexOf('spoofer')    == -1) &&
                  (agent.indexOf('compatible') == -1) &&
                  (agent.indexOf('opera')      == -1) &&
                  (agent.indexOf('webtv')      == -1));
    this.ns4    = (this.ns && (this.major      ==  4));
    this.ns6    = (this.ns && (this.major      >=  5));
    this.ie     = (agent.indexOf("msie")       != -1);
    this.ie3    = (this.ie && (this.major      <   4));
    this.ie4  	= (this.ie && (this.major >= 4));
    this.ie5    = (this.ie && (this.major      ==  4) &&
                  (agent.indexOf("msie 5.0")   != -1));
    this.ieX    = (this.ie && !this.ie3 && !this.ie4);
}


var is = new Is();
	
	function layerObject(id,left,top) {
		if (is.ie5||is.ns6){
		this.obj = document.getElementById(id).style;
		this.obj.left = left;
		this.obj.top = top;
		return this.obj;
		} else if(is.ie4) {
		this.obj = document.all[id].style;
		this.obj.left = left;
		this.obj.top = top;
		return this.obj;
		} else if(is.ns4) {
		this.obj = document.layers[id];
		this.obj.left = left;
		this.obj.top = top;
		return this.obj;
		}  
}

function layerSetup(Larghezza,Altezza) {
		centerLyr = new layerObject('centerLayer', available_width/2-Larghezza/2,available_height/2-Altezza/2);
		
}