var agt=navigator.userAgent.toLowerCase();
	//alert(agt);
	if (agt.indexOf("safari") != -1){ 
		document.write('<style type="text/css">@import url(css/safari.css);</style>');
	}
	if (agt.indexOf("msie") != -1){ 
		document.write('<style type="text/css">@import url(css/ie7.css);</style>');
	}
	if (agt.indexOf("firefox") != -1){ 
		document.write('<style type="text/css">@import url(css/firefox.css);</style>');
	}