function show_no_error() {
	document.getElementById('field_text').className = 'field_text';document.getElementById('text_error').className = 'no_text_error';
}

function mail(str) { 
	return /^[a-z,0-9]{1}[0-9,a-z,._+-]+@([a-z,0-9]{1}[0-9,a-z,_-]*[a-z,0-9]{1}[.])+[a-z,0-9]{2,5}$/i.test(str); 
}

function truemail(value){ 
	if( (!mail(value.value) ) ||  (value.length == 0) ) { 
		document.getElementById('field_text').className = 'field_text_error';
		document.getElementById('text_error').className = 'text_error';
		return false;
	}
	else {
		return true;
	}
}