//
// a replacement for escape() which encodes the data using UTF8
//
// (C)2004 Cal Henderson <cal@iamcal.com>
//

function escape_utf8(data) {

	if (data == '' || data == null){
		return '';
	}

	var buffer = '';
	for(var i=0; i<data.length; i++){
		var c = data.charCodeAt(i);
		var bs = new Array();

		if (c > 0x10000){
			// 4 bytes
			bs[0] = 0xF0 | ((c & 0x1C0000) >>> 18);
			bs[1] = 0x80 | ((c & 0x3F000) >>> 12);
			bs[2] = 0x80 | ((c & 0xFC0) >>> 6);
			bs[3] = 0x80 | (c & 0x3F);

		}else if (c > 0x800){
			// 3 bytes
			bs[0] = 0xE0 | ((c & 0xF000) >>> 12);
			bs[1] = 0x80 | ((c & 0xFC0) >>> 6);
			bs[2] = 0x80 | (c & 0x3F);

		}else if (c > 0x80){
			// 2 bytes
			bs[0] = 0xC0 | ((c & 0x7C0) >>> 6);
			bs[1] = 0x80 | (c & 0x3F);

		}else{
			// 1 byte
			bs[0] = c;
		}

		for(var j=0; j<bs.length; j++){
			var b = bs[j];
			var hex = nibble_to_hex((b & 0xF0) >>> 4) + nibble_to_hex(b & 0x0F);
			buffer += '%'+hex;
		}
	}

	return buffer;
}

function nibble_to_hex(nibble){
	var chars = '0123456789ABCDEF';
	return chars.charAt(nibble);
}