function isFilled(elm) {
	if (elm.value=="" || elm.value==null) {
		return false;
	} else {
		return true;
	}
}

function validEmail(email) {
	invalidChars = " /:,;";
	for (i=0; i<invalidChars.length; i++) {	// does it contain any invalid characters?
		badChar = invalidChars.charAt(i);
		if (email.indexOf(badChar,0) > -1) {
			return false;
		}
	}
	atPos = email.indexOf("@",1)	// there must be one "@" symbol
	if (atPos == -1) {
		return false;
	}
	if (email.indexOf("@",atPos+1) != -1) {	// and only one "@" symbol
		return false;
	}
	periodPos = email.indexOf(".",atPos)
	if (periodPos == -1) {	// and at least one "." after the "@"
		return false;
	}
	if (periodPos+3 > email.length)	{	// must be at least 2 characters after the "."
		return false;
	}
	return true;
}