Winzer,
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
</head>
<body>
<div id="divka" ></div>
<script>
var colors = [ "color:red",
"color:green",
"color:yellow",
"color:blue" ];
for(var i=0;i<colors.length;i++){
var rand = Math.floor(Math.random()*colors.length);
var divka = document.getElementById("divka");
divka.innerHTML += "<p style='" + colors[rand] + "'> " + "Hello world!" + "</p>";
}
</script>
</body>
</html>