Javascript上からCSSを操作する方法
ソース：
<html>
<head>
<script language="JavaScript">
counter=1;
function Test(){
if(counter==1){
document.getElementById("content").style.background = "blue";
counter=2;
}else if(counter==2){
document.getElementById("content").style.background = "green";
counter=1;
}
setTimeout("Test()",5000);
}
</script>
</head>
<body id="content" onload="Test()">
</body>
</html>
解説：
