isMac = (navigator.appVersion.indexOf("Mac") != -1);
isWindows = (navigator.appVersion.indexOf("Windows") != -1);

isIE6 = (navigator.appVersion.indexOf("MSIE 6") != -1)
isIE = (navigator.appVersion.indexOf("MSIE 7") != -1)

if (isIE) {
	document.write('<link rel="stylesheet" type="text/css" href="style/ie7.css">');
	//alert("ie7");
}
if (isIE6) {
	document.write('<link rel="stylesheet" type="text/css" href="style/ie6.css">');
	//alert("ie6");
}