var ssites = [
"mastertalk.ru",
"talk.maulnet.ru",
"armadaboard.com"
];
var sqs = "";
var sqt="";
for (var i=0, k=ssites.length; i<k; i++) {
	if(i==k-1) {
		sqs += ssites[i];
	}
	else {
		sqs += ssites[i]+", ";
	}
}
document.getElementById('searchform').site.value = sqs;