function vfText(value, minSize, maxSize, allowedValues){
	//System constants
	var AllowedChars = allowedValues;
	var i = 0;
	//Check if the value contains nothing other than the allowed values
	for(i=0; i<value.length; i++){
		if(AllowedChars.indexOf(value.substr(i,1)) == -1){
			return false;
		}
	}
	//Check the min size and max size
	if(value.length < minSize || value.length > maxSize){
		return false;
	}
	//Value is ok
	return true;
}
function vfTextAllChars(value, minSize, maxSize){
	//Check the min size and max size
	if(value.length < minSize || value.length > maxSize){
		return false;
	}
	//Value is ok
	return true;
}