browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
NS4=((navigator.appVersion.indexOf("MSIE")==-1)||((browserName == "Netscape") && (browserVer >= 3)))?true:false;
IE4=(document.all)?true:false;
V4=(NS4 || IE4)?true:false;
NS6=(NS4 && browserVer >= 5)?true:false;

if ((navigator.appVersion.indexOf("Mac")!=-1) &&(navigator.appVersion.indexOf("MSIE 4")!=-1) ){
	document.write('<LINK REL=\"stylesheet\" type=\"text/css\" href=\"'+root_site+'css/styles_MAC_IE.css\">');
} else if ((navigator.appVersion.indexOf("Mac")!=-1) && (navigator.appVersion.indexOf("MSIE")==-1)){
	document.write('<LINK REL=\"stylesheet\" type=\"text/css\" href=\"'+root_site+'css/styles_MAC_NS.css\">');
} else if ((navigator.appVersion.indexOf("MSIE")==-1) && (NS6) ){
	document.write('<LINK REL=\"stylesheet\" type=\"text/css\" href=\"'+root_site+'css/styles_PC_NS6.css\">');
} else if ((navigator.appVersion.indexOf("MSIE")==-1) && (!NS6) ){
	document.write('<LINK REL=\"stylesheet\" type=\"text/css\" href=\"'+root_site+'css/styles_PC_NS.css\">');
} else {
	document.write('<LINK REL=\"stylesheet\" type=\"text/css\" href=\"'+root_site+'css/styles_PC_IE.css\">');
}