<script language="JavaScript1.2">
function test() {
if((a.b.value.indexOf ("sex") == 0)||(a.b.value.indexOf ("fuck") == 0)){
alert("五讲四美三热爱");
a.b.focus();
return false;}
}
</script>
<form name=a onsubmit="return test()">
<input type=text name=b>
<input type="submit" name="Submit" value="check">
</form>
