if(navigator.appVersion.indexOf("Mac") != -1)
{
    if(navigator.userAgent.indexOf("Safari") != -1)
    {
        document.write("<link href=\"_css/StyleSheet_safari.css\" rel=\"stylesheet\" type=\"text/css\"></link>");
    }
    else if(navigator.userAgent.indexOf("Firefox") != -1)
    {
        document.write("<link href=\"_css/StyleSheet_ff.css\" rel=\"stylesheet\" type=\"text/css\"></link>");
    }
    else
    {
        document.write("<link href=\"_css/StyleSheet_safari.css\" rel=\"stylesheet\" type=\"text/css\"></link>");
    }
}
else if(navigator.userAgent.indexOf("MSIE") != -1)
{

   if(navigator.userAgent.indexOf("MSIE 6") > 1)
	{
		document.write("<link href=\"_css/StyleSheet_ie.css\" rel=\"stylesheet\" type=\"text/css\"></link>");
		document.write("<link href=\"_css/StyleSheet_ie6.css\" rel=\"stylesheet\" type=\"text/css\"></link>");
    }
    else {
    if(navigator.userAgent.indexOf("MSIE 7") > 1)
    {
		document.write("<link href=\"_css/StyleSheet_ie.css\" rel=\"stylesheet\" type=\"text/css\"></link>");
		}
    }
}
else if(navigator.userAgent.indexOf("Firefox") != -1) {
 if (/Firefox[\/\s](\d+\.\d+)/.test(navigator.userAgent)) {
    var ffversion = new Number(RegExp.$1)
    if (ffversion >= 3.0 && ffversion <= 3.1) {
        document.write("<link href=\"_css/StyleSheet_ff_30.css\" rel=\"stylesheet\" type=\"text/css\"></link>");
    }
    else {
        document.write("<link href=\"_css/StyleSheet_ff.css\" rel=\"stylesheet\" type=\"text/css\"></link>");
    }
  } 
}
else if(navigator.userAgent.indexOf("Safari") != -1)
{
    document.write("<link href=\"_css/StyleSheet_safari.css\" rel=\"stylesheet\" type=\"text/css\"></link>");
}
/*    alert(navigator.userAgent.indexOf("Safari"));
else if(navigator.userAgent.indexOf("Opera") != -1)
{
    document.write("<link href=\"_css/SiteStyles_opera.css\" rel=\"stylesheet\" type=\"text/css\"></link>");
}
*/