//编码程序： 
	function CodeCookie(str) 
	{ 
　		var strRtn=""; 

　		for (var i=str.length-1;i>=0;i--) 
　		{ 
　　		strRtn+=str.charCodeAt(i); 
　　		if (i) strRtn+="a"; //用a作分隔符 
　		} 
　		return strRtn; 
	}
		//解码程序： 
	function DecodeCookie(str) 
	{ 
　		var strArr; 
　		var strRtn=""; 

　		strArr=str.split("a"); 

　		for (var i=strArr.length-1;i>=0;i--) 
　		strRtn+=String.fromCharCode(eval(strArr[i])); 

　		return strRtn; 
	} 	
	function utf16to8(str)
	{
		var out, i, len, c;

		out = "";
		len = str.length;
		for(i = 0; i < len; i++) {
		c = str.charCodeAt(i);
		if ((c >= 0x0001) && (c <= 0x007F)) {
			out += str.charAt(i);
		} else if (c > 0x07FF) {
			out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
			out += String.fromCharCode(0x80 | ((c >>  6) & 0x3F));
			out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));
		} else {
			out += String.fromCharCode(0xC0 | ((c >>  6) & 0x1F));
			out += String.fromCharCode(0x80 | ((c >>  0) & 0x3F));
		}
			}
		return out;
	}

	function utf8to16(str)
	 {
		var out, i, len, c;
		var char2, char3;

		out = "";
		len = str.length;
		i = 0;
		while(i < len) {
		c = str.charCodeAt(i++);
		switch(c >> 4)
		{ 
		case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
			// 0xxxxxxx
			out += str.charAt(i-1);
			break;
		case 12: case 13:
			// 110x xxxx   10xx xxxx
			char2 = str.charCodeAt(i++);
			out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
			break;
		case 14:
			// 1110 xxxx  10xx xxxx  10xx xxxx
			char2 = str.charCodeAt(i++);
			char3 = str.charCodeAt(i++);
			out += String.fromCharCode(((c & 0x0F) << 12) |
				((char2 & 0x3F) << 6) |
				((char3 & 0x3F) << 0));
			break;
		}
			}

		return out;
	}

	var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	var base64DecodeChars = new Array(
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
    -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
    -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);
	//客户端Base64编码
	function base64encode(str)
	{
		var out, i, len;
		var c1, c2, c3;

		len = str.length;
		i = 0;
		out = "";
		while(i < len) {
			c1 = str.charCodeAt(i++) & 0xff;
			if(i == len)
			{
				out += base64EncodeChars.charAt(c1 >> 2);
				out += base64EncodeChars.charAt((c1 & 0x3) << 4);
				out += "==";
				break;
			}
			c2 = str.charCodeAt(i++);
			if(i == len)
			{
				out += base64EncodeChars.charAt(c1 >> 2);
				out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
				out += base64EncodeChars.charAt((c2 & 0xF) << 2);
				out += "=";
				break;
			}
			c3 = str.charCodeAt(i++);
			out += base64EncodeChars.charAt(c1 >> 2);
			out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
			out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6));
			out += base64EncodeChars.charAt(c3 & 0x3F);
		}
		return out;
	}
	//客户端Base64解码
	function base64decode(str) {
		var c1, c2, c3, c4;
		var i, len, out;

		len = str.length;
		i = 0;
		out = "";
		while(i < len) {
	  /* c1 */
	  do {
		c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
			} while(i < len && c1 == -1);
			if(c1 == -1)
				break;

			/* c2 */
			do {
				c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
			} while(i < len && c2 == -1);
			if(c2 == -1)
				break;

			out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));

			/* c3 */
			do {
				c3 = str.charCodeAt(i++) & 0xff;
				if(c3 == 61)
			return out;
				c3 = base64DecodeChars[c3];
			} while(i < len && c3 == -1);
			if(c3 == -1)
				break;

			out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));

			/* c4 */
			do {
				c4 = str.charCodeAt(i++) & 0xff;
				if(c4 == 61)
			return out;
				c4 = base64DecodeChars[c4];
			} while(i < len && c4 == -1);
			if(c4 == -1)
				break;
			out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
		}
		return out;
	}