값 체크하기

<script>function checkForm3() {	var cf = document.wform4;	if(cf.name.value=="") {		alert("이름을 입력하세요");		cf.name.focus();		return ;	}	if(cf.hp.value=="") {		alert("연락처를 입력하세요");		cf.hp.focus();		return ;	}	if(cf.agree.checked=="") {		alert("개인정보 수집에 동의해주세요");		return false;	}		cf.submit();	}</script><form action="../theme/mw/kakao_update.php" method="post" name="wform4"><input type="text" name="name" class="txt1"><input type="text" name="hp" class="txt1" maxlength="13"><select name="part" class="txt1"><option value="1">1</option><option value="2">2 </option><option value="3">3</option></select><input type="checkbox" name="agree" style="width:20px;height:20px;border-radius:10px 10px;border:0">		<a href="javascript:;" onclick="javascript:checkForm3()"><img src="<?php echo G5_THEME_IMG_URL?>/main/kakao_btn.png" alt="상담신청하기"/ ></a>		</form>

$name = $_POST["name"];$hp = $_POST["hp"];$ip = $_SERVER["REMOTE_ADDR"];$date = date("Y-m-d H:i:s");	$sql = "insert into db_form set			what='카카오',			name='". $name. "',			hp='". $hp. "',			part='". $part. "',			ip='". $ip. "',			date='". $date. "'			"; 	sql_query($sql);