<script language="javascript"> var a; do{ a=prompt('ぬるぽ',''); }while(a!='ガッ'||a==null); alert(' #3

<script language="javascript">
var a;
do{
a=prompt('ぬるぽ','');
}while(a!='ガッ'||a==null);
alert('正解！');
</script>