function urlEncode(plaintext) {
	var SAFECHARS = "0123456789" +			// Numeric
			"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +	// Alphabetic
			"abcdefghijklmnopqrstuvwxyz" +
			"-_.!~*'()";			// RFC2396 Mark characters
	var HEX = "0123456789ABCDEF";
	var encoded = "";
	for (var i = 0; i < plaintext.length; i++ ) {
		var ch = plaintext.charAt(i);
		if (ch == " ") {
			// x-www-urlencoded, rather than %20
			encoded += "+";
		}
		else if (SAFECHARS.indexOf(ch) != -1) {
			encoded += ch;
		}
		else {
			var charCode = ch.charCodeAt(0);
			if (charCode > 255) {
				// Convert unicode characters to spaces
				alert("Unicode Character '" + ch + "' cannot be encoded using standard URL encoding.\n(URL encoding only supports 8-bit characters.)\nA space (+) will be substituted.");
				encoded += "+";
			}
			else {
				encoded += "%";
				encoded += HEX.charAt((charCode >> 4) & 0xF);
				encoded += HEX.charAt(charCode & 0xF);
			}
		}
	}

	return encoded;
};

function showPic(id, imgid, description) {
	var popurl = "index.php?mod=kuva&id=" + id + "&num=" + imgid + "&description=" + urlEncode(description);
	popwin = window.open(popurl, "", "width=200,height=200");
};