function valLogin(theForm) {
	if(!theForm.username.value)	{
		alert('Please enter your username');
		theForm.username.focus();
		return false;
	}
	
	if(!theForm.password.value)	{
		alert('Please enter your password');
		theForm.password.focus();
		return false;
	}
	
	return true;
}

function valUsername(theField) {
	if(theField.value == 'Username') {
		theField.value = '';	
	}
}

function valPassword(theField) {
	if(theField.value == 'Password') {
		theField.value = '';	
	}
}

function valSearch(theForm) {
	
	if(!theForm.keyword.value)	{
		alert('Please enter some keywords');
		theForm.keyword.focus();
		return false;
	}
	
	return true;
}