var browser_type=navigator.appName
var browser_version=parseInt(navigator.appVersion)
ie=(navigator.appVersion.indexOf("MSIE")!=-1)?true:false
mac=(navigator.appVersion.indexOf("Mac")!=-1)?true:false
//distinguish btw ie 4 & 5
if(browser_type=="Microsoft Internet Explorer")
{var spec=navigator.appVersion
var iespec=spec.split(";")
var iespec1=iespec[1].split(" ")
browser_version=parseInt(iespec1[2])
}
//if NS 6
if (browser_type=="Netscape"&&browser_version>=5)
browtype=6
//if IE 5+
else if (browser_type=="Microsoft Internet Explorer"&&browser_version>=5)
browtype=1
// IE4
else if (browser_type=="Microsoft Internet Explorer"&&browser_version>=4&&browser_version<5)
browtype=4
//if NS4+
else if (browser_type=="Netscape"&&browser_version>=4)
browtype=2
//NS3
else if (browser_type=="Netscape"&&browser_version>=3)
browtype = 3;
//Default goto page (NOT NS 4+ and NOT IE 4+)
else
browtype=-1
var browser_agent=navigator.userAgent

if (browser_agent.indexOf("Firefox")!=-1) var Firefox=true