function trim(stringa) {
	while (stringa.substring(0,1) == ' ') {stringa = stringa.substring(1, stringa.length);}
	while (stringa.substring(stringa.length-1, stringa.length) == ' ') {stringa = stringa.substring(0,stringa.length-1);}
	return stringa;
}
function isValidRequiredField(field) {
	if (trim(field.value)=="") return false;
	return true;
}
function isValidEmail(field) {
	if (trim(field.value)=="") return false;
	return emailCheck(field.value);
}
function isValidDate(gg,mm,yyyy) {
	var dateString = yyyy+"/"+mm+"/"+gg;
	var myDate = new Date(dateString); 
	if (isNaN(myDate)) return false;
	return true;
}
function isValidCompareFields(field,fieldr) {
	return (field.value==fieldr.value);
}