var ie = false
var ns = false
var opera = false
var webtv = false
var com = false

var ver_m = parseInt(navigator.appVersion)
var ver_f = parseFloat(navigator.appVersion)
var user_agent = navigator.userAgent.toLowerCase()

if (user_agent.indexOf("opera") != -1){opera = true}
else if (user_agent.indexOf("webtv") != -1){webtv = true}
else if (user_agent.indexOf("msie") != -1){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)){
ns = true
}
else {com = true}
}

/*
Размеры содержимого документа
MSIE, Opera 7 - document.body.scrollWidth, scrollHeight
Netscape, Mozilla - document.width, height
Opera 5, 6 - document.body.style.pixelWidth, pixelHeight
*/