ecco il Js


function echeck(str) {

var at="@"
var dot="."
var lat=str.indexOf(at)
var lstr=str.length
var ldot=str.indexOf(dot)
if (str.indexOf(at)==-1){
alert("Invalid E-mail ID")
return false
}

if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
alert("Invalid E-mail ID")
return false
}

if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
alert("Invalid E-mail ID")
return false
}

if (str.indexOf(at,(lat+1))!=-1){
alert("Invalid E-mail ID")
return false
}

if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
alert("Invalid E-mail ID")
return false
}

if (str.indexOf(dot,(lat+2))==-1){
alert("Invalid E-mail ID")
return false
}

if (str.indexOf(" ")!=-1){
alert("Invalid E-mail ID")
return false
}

return true
}

function ValidateForm(){
var emailID=document.frmSample.txtEmail
var nome=document.frmSample.nome
var cognome=document.frmSample.cognome
var azienda=document.frmSample.azienda
var stato=document.frmSample.stato

if ((emailID.value==null)||(emailID.value=="")){
alert("Please Enter your Email ID")
emailID.focus()
return false
}
if ((nome.value==null)||(nome.value=="")){
alert("Please Enter your Name")
nome.focus()
return false
}
if ((cognome.value==null)||(cognome.value=="")){
alert("Please Enter your Surname")
cognome.focus()
return false
}
if ((azienda.value==null)||(azienda.value=="")){
alert("Please Enter your Company")
azienda.focus()
return false
}
if ((stato.value==null)||(stato.value=="")){
alert("Please Enter your State")
stato.focus()
return false
}
if (echeck(emailID.value)==false){
emailID.value=""
emailID.focus()
return false
}
return true
}
</script>