var agt=navigator.userAgent.toLowerCase();

if (agt.indexOf("ie 6") > -1 )
{
	//alert("ie 6");
	document.write("<link rel='stylesheet' href='style/ie6.css' type='text/css' media='screen' />"); 
}
else if (agt.indexOf("ie 7") > -1 )
{
	//alert("ie 7");
	document.write("<link rel='stylesheet' href='style/ie7.css' type='text/css' media='screen' />"); 
}
else if (agt.indexOf("safari") > -1 )
{
	//alert("safari");
	document.write("<link rel='stylesheet' href='style/safari.css' type='text/css' media='screen' />"); 
}
else
{
	//alert(agt);
	document.write("<link rel='stylesheet' href='style/moz.css' type='text/css' media='screen' />"); 
}