var spot="off"
var agt=navigator.userAgent.toLowerCase();

		var spotLayer= new Array("navigation", "head_1", "head_2", "top_nav", "c_head", "legend", "discription", "p_title", "m_images");
		function spotswitch() {
			if ( agt.indexOf('x11')==-1 && agt.indexOf('opera')==-1 && agt.indexOf('mac')==-1 ) {
				if (spot=="off") {
					if(document.getElementById('navigation').filters) {
						for (var i = 0; i < spotLayer.length; i++) {
							document.getElementById(spotLayer[i]).filters.alpha.opacity=40;
						}
					}else{
						for (var i = 0; i < spotLayer.length; i++) {
							document.getElementById(spotLayer[i]).style.MozOpacity=0.4;
						}			
					}
					document.body.style.background = 'url("/static/images/bg_spot.gif") repeat-y #000000';
					document.getElementById('navigation').style.background = 'url()';
					if (document.getElementById('spotlink').innerHTML) {
						document.getElementById('spotlink').innerHTML = "[Spot aus]";
					}
					spot="on";
				} else {
					if(document.getElementById('navigation').filters) {
						for (var i = 0; i < spotLayer.length; i++) {
							document.getElementById(spotLayer[i]).filters.alpha.opacity=100;
						}
					}else{
						for (var i = 0; i < spotLayer.length; i++) {
							document.getElementById(spotLayer[i]).style.MozOpacity=1.0;
						}						
					}
					document.body.style.background = 'url("/static/images/bg_einzelbild.gif") repeat-y #000000';
					document.getElementById('navigation').style.background = 'url("/static/images/nav_bg.jpg") no-repeat';
					if (document.getElementById('spotlink').innerHTML) {
						document.getElementById('spotlink').innerHTML = "[Spot an]";
					}
					spot="off";
				}
			}
		}