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
	 }