[javascript] 간단한 애니메이션

<h1>여기는 index3입니다.</h1>

<form name="myForm">
   <input type="text" size="30" name="myFormMsg">
</form>

<script type="text/javascript">
var myMsg = "환영합니다 어서오십시오";
var myCnt = 0;

function myFunc() {
   document.myForm.myFormMsg.value = myMsg.substring(0, myCnt) + "_";

   myCnt = ( myCnt == myMsg.length ) ? 0 : myCnt+1;
}

setInterval("myFunc()", 500);

</script>