<head>

<script>

var isBlinked = false;

function blinkText( )
{
document.getElementById('blinkingText').style.colo r = isBlinked ? "red" : "black";
isBlinked = !isBlinked;

setTimeout( " blinkText( ); ", 250 );
}


</script>

</head>

<body onload="blinkText( );" ...>
<div id="blinkingText">TESTO LAMPEGGIOSO </div>