function ValidEmail(email) 
{
	invalidChars = " /:,;"
	if(email=="") 
		return false;

	for(i=0;i<invalidChars.length;i++) 
	{
		badChar = invalidChars.charAt(i)
		if(email.indexOf(badChar) != -1)
			return false;
	}
	
	atPos = email.indexOf("@")
	if((atPos==-1)||(atPos < 2)) 
		return false;
	
	if(email.indexOf("@", atPos + 1) != -1) 
		return false;
	
	periodPos = email.indexOf(".", atPos + 2)
	if(periodPos == -1)
		return false;
		
	if(periodPos + 3 > email.length)
		return false;
	
	return true;
}