function opera_stylesheet(){
	try{
		if(navigator.userAgent.indexOf("Opera")> -1){
			document.write("<link href=\"/stylesheets/screen-opera.css\" media=\"screen\" rel=\"stylesheet\" type=\"text/css\" />");
		}
	}catch(e){
		//alert(e);
	}	
}

function webkit_stylesheet(){
	try{
		if(navigator.userAgent.indexOf("AppleWebKit")> -1){
			document.write("<link href=\"/stylesheets/screen-webkit.css\" media=\"screen\" rel=\"stylesheet\" type=\"text/css\" />");
		}	
	}catch(e){
		//alert(e);
	}	
}