function isForm() {
    var agt=navigator.userAgent.toLowerCase()
    this.major = parseInt(navigator.appVersion)
    this.win   = (agt.indexOf("win")!=-1)
    this.mac    = (agt.indexOf("mac")!=-1)
    this.nav  = ((agt.indexOf('mozilla')!=-1) && ((agt.indexOf('spoofer')==-1) && (agt.indexOf('compatible')==-1)))
    this.nav3 = (this.nav && (this.major == 3))
    this.nav4 = this.nav && (this.major == 4)
    this.nav6 = this.nav && (this.major >= 5)
    this.ie   = (agt.indexOf("msie") != -1)
    this.ie3  = (this.ie && (this.major == 2))
    this.ie4n5  = this.ie  && (this.major == 4)
    this.ie5up = this.ie  && (this.major >= 5)
}
var isForm;
isForm = new isForm();

if(isForm.nav || isForm.nav3 || isForm.nav4 || isForm.nav6){
var nn = 1;}
else{
var nn = 0;}