var u_agent = navigator.userAgent.toLowerCase();

var is_ie = (u_agent.indexOf("msie") != -1);
var is_gecko = (u_agent.indexOf("gecko") != -1);
var is_opera = (u_agent.indexOf("opera") != -1);
var is_safari = (u_agent.indexOf("safari") != -1);

if (is_safari) {
	document.write("<link rel='stylesheet' href='../css/common/gecko_style_sheet.css' type='text/css'>");
}

if (is_opera) {
	var version = getVersion(u_agent, "opera/");
	if (version >= '7.0'){
		document.write("<link rel='stylesheet' href='../css/common/opera_style_sheet.css' type='text/css'>");
	}
}
else if (is_ie) {
	var version = getVersion(u_agent, "msie ");
	if (version != null) {
		if(version >= '5.5'){
			document.write("<link rel='stylesheet' href='../css/common/ie_style_sheet.css' type='text/css'>");
		}
	}
}
else if (is_gecko) {
	var version = getVersion(u_agent, "rv:");
	if (version != null) {
		if (version >= '0.9') {
			document.write("<link rel='stylesheet' href='../css/common/gecko_style_sheet.css' type='text/css'>");
		}
	} 
	else {
		var i = u_agent.indexOf("galeon");
		version = getVersion(u_agent, "galeon/");
		if (version != null) {
			if (version >= '1.3') {
				document.write("<link rel='stylesheet' href='../css/common/gecko_style_sheet.css' type='text/css'>");			
			}
		}
	}
}
else {
	alert("Stock Boulevard: Your browser is not supported - text only version follows - if you feel this is in error, please email general@stockboulevard.com");
}