function css_detect(param) {

	var version_msg = "Version info:\n" +

		"css_detect $Id: css.js,v 1.1.1.1 2005/06/30 08:30:39 hillebrand Exp $\n";

	var usage_url = "css_detect_usage.txt";

	var compat_url = "css_detect_compatibility.txt";

	

	// Define default properties, undefined values not allowed:

	var def = {

		base: "",

		debug: 0,

		version: null,

		help: null,

		compat: null

	}

	

	// Warn for the use of unused properties in the call:

	for (var prop in param) {

		eval(

			"if (typeof def." + prop + "== 'undefined') " +

			"alert('Warning: \"" + prop + "\" is an unused property.')"

		);

	}

		

	// Generate local variable based on the properties used for this function:

	var p = {};

	for (prop in def) {

		p[prop] = (typeof param[prop] == 'undefined') ? def[prop] : param[prop];

	}



	// Display info when needed:

	if (p.version != null) alert(version_msg);

	var pop_opts = 'resizable=yes,scrollbars=yes';

	if (p.help != null) {

		window.open(usage_url,'css_detect',pop_opts);

		return;

	}

	else if (p.compat != null) {

		window.open(compat_url,'css_detect',pop_opts);

		return;

	}



	// Payload here:

	

	var ua = navigator.userAgent;

	var css = "default";

	if (

		(ua.indexOf("MSIE") == -1)

		&& (ua.indexOf("/4.") != -1)

	) {

		css = "ns4x" + ((ua.indexOf("Win") != -1) ? "win" : "mac");

	}

	if (navigator.userAgent.indexOf("Gecko") != -1) {

		css = "gecko";

	}



	if (p.base != "" && p.base.lastIndexOf("/") != p.base.length - 1) {

		p.base += "/";

	}

	out = "<link href='" + p.base + css + ".css' rel=stylesheet type='text/css'>";

	document.write(out);

}