Potapich,
cahngecolor (this.value)
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
</head>
<body>
<script type="text/javascript">
function cahngecolor(value)
{
document.getElementById("1").style.color= value;
}
</script>
<body>
<p id="1">hello</p>
<input type="button" onclick=" cahngecolor (this.value)" value="Red" />
<input type="button" onclick=" cahngecolor (this.value)" value="Blue" />
<input type="button" onclick=" cahngecolor (this.value)" value="Orange" />
</body>
</body>
</html>