function clientSniffer()
{
	var navig = navigator.appVersion;
	
	if( navig.indexOf( "MSIE" ) != -1 )
	{
		var ieVersion = navig.substr( navig.indexOf( "MSIE" ) + 5, 1 );

		if( Number( ieVersion ) ==  7 )
			document.write('<link rel="stylesheet" href="./css/main.css" media="screen" type="text/css" />' );
		else
			document.write('<link rel="stylesheet" href="./css/main_ie.css" media="screen" type="text/css" />' );
	}
	else
		document.write('<link rel="stylesheet" href="./css/main.css" media="screen" type="text/css" />');
}
clientSniffer();