function miez() {
	//alert( ' ' +agt+ ' - ' +is_major+ ' - ' +is_minor+ '' );
}


var visibleVar="null";

        if ( is_nav4 ) {
                                layerStyleRef="layer.";
                                layerRef="document.layers";
                                styleSwitch="";
                                visibleVar="show";
		} else if ( is_ie4up ) {
                                layerStyleRef="layer.style.";
                                layerRef="document.all";
                                styleSwitch=".style";
                                visibleVar="visible";
		} else if ( is_opera5 ) {
                                layerStyleRef="layer.";
                                layerRef="document.layers";
                                styleSwitch="";
                                visibleVar="show";
		} else if ( is_opera5up ) {
                                layerStyleRef="document.getElementById(";
                                layerRef="document.getElementById("; 			//document.getElementById("elementID").style
                                styleSwitch=").style";
                                visibleVar="visible";
		} else if ( is_gecko ) {
                                layerStyleRef="document.getElementById(";
                                layerRef="document.getElementById("; 			//document.getElementById("elementID").style
                                styleSwitch=").style";
                                visibleVar="visible";
		} else {
                                layerStyleRef="layer.style.";
                                layerRef="document.all";
                                styleSwitch=".style";
                                visibleVar="visible";
		}


        function layerSwitch(layerName){
                if (eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility == visibleVar')){
                        hideLayer(layerName);
                }else{
   			hideAll();
                        showLayer(layerName);
                }
        }
        function showLayer(layerName){
                eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility=visibleVar');
        }

        function hideLayer(layerName){
                eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility="hidden"');
        }

function hideAll()
	{
   	if ( is_nav4)
   		{
        document.layers["L01"].visibility = "hide";
	document.layers["L02"].visibility = "hide";
   		}
   	if (is_ie4up)
		{
	    document.all.L01.style.visibility="hidden";
	    document.all.L02.style.visibility="hidden";
   		}
   	if (is_gecko)
		{
	    document.getElementById('L01').style.visibility="hidden";
	    document.getElementById('L02').style.visibility="hidden";
   		}
	}