Web@Youtility

※javascript部分
<script type="text/javascript"><!--
function setCSS(){
var colorcode = "#eecb8b";
var colorcode2 = "pink";
test1.style.backgroundColor = colorcode;
test3.style.backgroundColor = colorcode2;

}
function resetCSS(){
var colorcode = "aliceblue";
var i;
test1.style.backgroundColor = colorcode;
test2.style.backgroundColor = colorcode;
test3.style.backgroundColor = colorcode;
test4.style.backgroundColor = colorcode;

}
-->
</script>

※Body部分
<form>
<input type="button" value="背景色の変更" onClick="setCSS()">
<input type="button" value="戻す" onClick="resetCSS()">
</form>
<div id="test1">ＢａｃｋＧｒｏｕｎｄＣｈａｇｅ</div>
<div id="test2">ＢａｃｋＧｒｏｕｎｄＣｈａｇｅ</div>
<div id="test3">ＢａｃｋＧｒｏｕｎｄＣｈａｇｅ</div>
<div id="test4">ＢａｃｋＧｒｏｕｎｄＣｈａｇｅ</div>