//detecting platform
	var agt=navigator.userAgent.toLowerCase(); 
	var is_major = parseInt(navigator.appVersion); 
	var is_minor = parseFloat(navigator.appVersion); 
	var is_win = ( (agt.indexOf("win")!=-1) || (agt.indexOf("16bit")!=-1) );
	var is_mac = (agt.indexOf("mac")!=-1);
	ns4 = (document.layers)? true:false
	ie4 = (document.all)? true:false

//writing cascading style sheets if certain platform, certain browser
if (is_win && ns4){
mystyle="<link rel=stylesheet href=style/main-liquidbook.css>"
}else if (is_win && ie4){
mystyle="<link rel=stylesheet href=style/main-liquidbook.css>"
}else if (is_mac && ns4){
mystyle="<link rel=stylesheet href=style/mac-nn-liquidbook.css>"
}else if (is_mac && ie4){
mystyle="<link rel=stylesheet href=style/mac-ie-liquidbook.css>"
}else{
mystyle="<link rel=stylesheet href=style/main-liquidbook.css>"
}
var writeCss=mystyle;

document.write(writeCss);
//end of cascading style sheets control