function preview(op, cat) {
	var theme = op.options[op.selectedIndex].text;
	var el = document.getElementById(cat);
	el.className = "box " + theme;
}

function clearAll(el) {
	var check = el.checked;
	var f = document.forms[0];
	for (i=0; i<f.length; i++) {
		if (f[i].type == "checkbox") {
			f[i].checked = false;
		}
	}
	el.checked = check;
}

function setOps() {
	var f = document.forms[0]["rss[]"];
	var ops = f[0].options;
	for (i=0; i<f.length; i++) {
		for (j=0; j<ops.length; j++) {
			if (ops[j].text == f[i].id) {
				f[i][j].selected = true;
				break;
			}
		}
	}
}