메모) HTMLElement innerHTML Property / getElementById() Method

http://www.w3schools.com/jsref/prop_html_innerhtml.asp

http://www.w3schools.com/htmldom/dom_methods.asp

< .. id="xxx">

<script language=javascript>

document.getElementById('xxx').innerHTML = "블라블라블라"

또는

var yyy = document.getElementById('xxx')

var zzz = yyy.innerHTML

zzz를 갖고 이것저것

yyy.innerHTML = zzz

</script>