var blnTextBoxCleared = false;

function clearTextBox( obj ) {
	if( !blnTextBoxCleared ) {
		obj.value = '';
		blnTextBoxCleared = true;
	}
}

function validate( form ) {
	strEmail = form.email.value; 
	if( strEmail.indexOf("@") < 2 ) {
		alert( "Please enter a valid email address" );
		return false;
	}
	return true;
}