daum, naver, yahoo,hanmail 계정은 입력할 수 없습니다<br>

<form name="validation" onSubmit="return checkbae()">
이메일 주소 입력 :
<input type="text" size=18 name="emailcheck"><br>
<input type="submit">
</form>

<script language="JavaScript1.2">

var invalidaddress=new Array()
invalidaddress[0]="daum"
invalidaddress[1]="naver"
invalidaddress[2]="yahoo"
invalidaddress[3]="hanmail"

var testresults
function checkemail(){
var invalidcheck=0;
var str=document.validation.emailcheck.value
var filter=/^(\w+(?:\.\w+)*)@((?:\w+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
if (filter.test(str)){
var tempstring=str.split("@")
tempstring=tempstring[1].split(".")
for (i=0;i<invalidaddress.length;i++){
if (tempstring[0]==invalidaddress[i])
invalidcheck=1
}
if (invalidcheck!=1)
testresults=true
else{
alert("입력 금지된 계정입니다")
testresults=false
}
}
else{
alert("이메일 주소가 유효하지 않습니다")
testresults=false
}
return (testresults)
}
function checkbae(){
if (document.layers||document.getElementById||document.all)
return checkemail()
else
return true
}
</script>