//Zentriere Basis Layer



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() {

		centerLyr = new layerObject('centerLayer', available_width/2-390,available_height/2-250);

		

}