function checkEmptyField(fieldName,classNameOk,classNameError) {
	var emptyString = /^\s*$/ ;
	var hightlightClass = "ui-state-error ui-corner-all";
	var normalClass = "ui-widget-content ui-corner-all";
	if(emptyString.test(document.getElementById(fieldName).value)) {
		document.getElementById(fieldName).className = classNameError;
		return true;
	} else {
		document.getElementById(fieldName).className = classNameOk;
		return false;
	}
}
function checkEmailField(fieldName,classNameOk,classNameError) {
	var emailString = /^[^@]+@[^@.]+\.[^@]*\w\w$/ ;
	var hightlightClass = "ui-state-error ui-corner-all";
	var normalClass = "ui-widget-content ui-corner-all";
	if(!emailString.test(document.getElementById(fieldName).value)) {
		document.getElementById(fieldName).className = classNameError;
		return true;
	} else {
		document.getElementById(fieldName).className = classNameOk;
		return false;
	}
}