var its_ie = false
var its_ns = false
var its_opera = false
var its_webtv = false
var its_compatible = false
var its_ie2 = false
var its_ie3 = false
var its_ie4 = false
var its_ie5 = false
var its_ie55 = false
var its_ie6 = false
var its_ie7 = false
var its_ie4plus = false
var its_ie5plus = false
var its_ie55plus = false
var its_ie6plus = false
var its_ie7plus = false
var its_ns2 = false
var its_ns3 = false
var its_ns4 = false
var its_ns6 = false
var its_ns3plus = false
var its_ns4plus = false
var its_ns6plus = false

var its_opera6 = false
var its_opera7 = false
var its_opera6plus = false
var its_opera7plus = false

var its_win31 = false
var its_win95 = false
var its_win98 = false
var its_winme = false
var its_winnt = false
var its_win2000 = false
var its_winxp = false
var its_windows = false
var its_win32 = false
var its_mac68k = false
var its_macppc = false
var its_macos = false
var its_linux = false
var its_other_os = false

var dhtml_ok = false

var user_agent = navigator.userAgent.toLowerCase()

if (user_agent.indexOf("opera") != -1) { its_opera = true }
else if (user_agent.indexOf("webtv") != -1) { its_webtv = true }
else if (user_agent.indexOf("msie") != -1) { its_ie = true }
else if (user_agent.indexOf("mozilla") != -1) {

    if ((user_agent.indexOf("compatible") == -1) && 
        (user_agent.indexOf("spoofer") == -1) && 
        (user_agent.indexOf("hotjava") == -1)) {
        its_ns = true
    }
    else { its_compatible = true }
}

var major_version = parseInt(navigator.appVersion)
var full_version = parseFloat(navigator.appVersion)
var ie_start = user_agent.indexOf("msie")
var opera_start = user_agent.indexOf("opera")


if (opera_start != -1) {
    var version_string = user_agent.substring(opera_start + 6)
    major_version = parseInt(version_string)
    full_version = parseFloat(version_string)
}
else if (ie_start != -1) {
    var version_string = user_agent.substring(ie_start + 5)
    major_version = parseInt(version_string)
    full_version = parseFloat(version_string)
}


if (its_opera) {
    if (major_version == 6) { its_opera6 = true }
    else if (major_version == 7) { its_opera7 = true }

    if (major_version >= 6) { its_opera6plus = true }
    if (major_version >= 7) { its_opera7plus = true }
}

if (its_ie || its_webtv || (its_opera7plus && its_opera)) {
    if (major_version < 3) { its_ie2 = true }
    else if (major_version == 3) { its_ie3 = true }
    else if (major_version == 4) { its_ie4 = true }
    else if (major_version == 5) { its_ie5 = true }
    else if (full_version == 5.5) { its_ie55 = true }
    else if (major_version == 6) { its_ie6 = true }
	else if (major_version == 7) { its_ie7 = true }

    if (major_version >= 4) { its_ie4plus = true }
    if (major_version >= 5) { its_ie5plus = true }
    if (full_version >= 5.5) { its_ie55plus = true }
    if (major_version >= 6) { its_ie6plus = true }
	if (major_version >= 7) { its_ie7plus = true }
}

if (its_ns) {
    if (major_version < 3) { its_ns2 = true }
    else if (major_version < 4) { its_ns3 = true }
    else if (major_version == 4) { its_ns4 = true }
    else if (major_version == 5) { its_ns6 = true }

    if (major_version >= 3) { its_ns3plus = true }
    if (major_version >= 4) { its_ns4plus = true }
    if (major_version >= 5) { its_ns6plus = true }
}

if ((user_agent.indexOf("windows 3.1") != -1) || 
    (user_agent.indexOf("win16") != -1) ||
    (user_agent.indexOf("16bit") != -1) ||
    (user_agent.indexOf("16-bit") != -1)) { its_win31 = true }

else if ((user_agent.indexOf("windows 95") != -1) || 
         (user_agent.indexOf("win95") != -1)) { its_win95 = true }

if (user_agent.indexOf("win 9x 4.90") != -1) { its_winme = true }

else if ((user_agent.indexOf("windows 98") != -1) || 
         (user_agent.indexOf("win98") != -1)) { its_win98 = true }

else if ((user_agent.indexOf("windows nt 5.1") != -1) || 
         (user_agent.indexOf("winnt 5.1") != -1)) { its_winxp = true }

else if ((user_agent.indexOf("windows nt 5.0") != -1) || 
         (user_agent.indexOf("winnt 5.0") != -1)) { its_win2000 = true }

else if ((user_agent.indexOf("windows nt") != -1) || 
         (user_agent.indexOf("winnt") != -1)) { its_winnt = true }

else if ((user_agent.indexOf("mac") != -1) && 
        ((user_agent.indexOf("68K") != -1) || 
         (user_agent.indexOf("68000") != -1))) { its_mac68k = true }

else if ((user_agent.indexOf("mac") != -1) && 
        ((user_agent.indexOf("ppc") != -1) || 
         (user_agent.indexOf("powerpc") != -1))) { its_macppc = true }
else if (user_agent.indexOf("linux") != -1) { its_linux = true }
else { its_other_os = true }

if (its_mac68k || its_macppc) { its_macos = true}

if (its_win95 || its_win98 || its_winme || its_winnt || its_win2000 || its_winxp) {its_win32 = true}

if (its_win31 || its_win32) {its_windows = true}

if (document.getElementById || document.all) {// || document.layers
    dhtml_ok = true
}