// JavaScript Document

function validEmail(email) {
	invalidChars = " /:,;"
	if (email == "") {

		return false

	}

	for (i=0; i<invalidChars.length; i++) {

		badChar = invalidChars.charAt(i)

		if (email.indexOf(badChar,0) > -1) {

			return false

		}

	}

	atPos = email.indexOf("@",1)

	if (atPos == -1) {

		return false

	}

	if (email.indexOf("@",atPos+1) > -1) {

		return false

	}

	periodPos = email.indexOf(".",atPos)

	if (periodPos == -1) {

		return false

	}

	if (periodPos+3 > email.length)	{

		return false

	}

	return true
}

function submitform(carForm) {			
	 if (!validEmail(carForm.mail.value)) {

		alert("Please, introduce your email address")

		carForm.mail.focus()

		carForm.mail.select()

		return false

	} 
	return true
}