function checkEmail(emailString,fieldName)
{
	var emailFilter=/^.+@.+\..{2,3}$/;
	var illegalChars= /[\(\)\<\>\,\;\:\\\/\"\[\]]/
	if(emailString == "")
		return "Please enter "+fieldName+" address.";
	if (!emailFilter.test(emailString))  
		return "Please enter a valid "+fieldName+" address.";
	if (emailString.match(illegalChars)) 
		return fieldName+" address contains illegal characters.";
	return "";
}

function checkValidCharString(strng,fieldName,min,max){

	var illegalChars = /[\~\`\!\@\#\$\%\^\&\*\>\<\?\}\{\+\=\-\|\(\)\<\>\,\;\:\\\/\"\[\]]/

	if (strng.match(illegalChars)) 
		return fieldName+" contains illegal characters.";
		
	if(min != 0 && strng == "")
		return "Please enter "+fieldName;		
		
	if ((strng.length < min ) || (strng.length > max)) 
       return fieldName+" is of wrong length (max"+max+", min"+ min+") chars";
       
    return "";
}