ie4 = ((navigator.appName == "Microsoft Internet Explorer") && (navigator.appVersion.indexOf("4.") != -1));
ie5 = ((navigator.appName == "Microsoft Internet Explorer") && (navigator.appVersion.indexOf("5.") != -1));
ie55 = ((navigator.appName == "Microsoft Internet Explorer") && (navigator.appVersion.indexOf("5.5") != -1));
ie6 = ((navigator.appName == "Microsoft Internet Explorer") && (navigator.appVersion.indexOf("6.") != -1));
ns4 = ((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) == 4 ));
ns5 = ((navigator.appName == "Gecko") && (parseInt(navigator.appVersion) > 4 ));
ns6 = ((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) > 4 ));

if (ns6) {
   layerVis0	= "hidden";
   layerVis1	= "visible";
   pre	        = 'document.getElementById("';
   post		= '")';
   style	= '.style';
} else if (ns5) {
   layerVis0	= "hidden";
   layerVis1	= "visible";
   pre		= 'document.getElementById("';
   post		= '")';
   style	= '.style';
} else if (ns4) {
   layerVis0 	= "hide";
   layerVis1 	= "show";
   pre		= 'document.layers["';
   post		= '"]';
   style	= '';
} else if (ie6) {	
   layerVis0	= "hidden";
   layerVis1	= "visible";
   pre		= 'document.getElementById("';
   post		= '")';
   style	= '.style';	
} else if (ie5) {
   layerVis0 	= "hidden";
   layerVis1	= "visible";
   pre		= 'document.getElementById("';		
   post		= '")';
   style	= '.style';
} else {
   layerVis0 	= "hidden";
   layerVis1 	= "visible";
   pre		= 'document.all.';
   post		= '';
   style	= ".style";
}