var browser = navigator.appVersion;

var safari = new RegExp("Safari");
var chrome = new RegExp("Chrome");

var safaritest = safari.test(browser);
var chrometest = chrome.test(browser);

if ((safaritest == true) || (chrometest == true))
{
	document.write("<link rel=\"stylesheet\" type=\"text/css\" href=\"browser_css/safarichrome.css\">");
}
else
{
	document.write("<link rel=\"stylesheet\" type=\"text/css\" href=\"browser_css/other.css\">");
}