Looks like you were close you just need to take a little more time checking your formatting…
There are a lot of unanswered questions here but this is what you were shooting for, I think.
<head>
<style type="text/css">
.ok
{
background-color:green;
}
.dead
{
background-color:red;
}
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script type="text/javascript">
var variable1 = '<?php echo($variable1); ?>';
function emea()
{
if(variable1 !== '')
{
document.getElementById('test').className="dead";
}
else
{
document.getElementById('test').className="ok";
}
}
</script>
</head>
<body onload="emea();">
<div id="test">BlaBla</div>
</body>
solved Javascript and “div” Tags