function utf8_encode (argString) {
	// Encodes an ISO-8859-1 string to UTF-8  
	// 
	// version: 1103.1210
	// discuss at: http://phpjs.org/functions/utf8_encode
	// +   original by: Webtoolkit.info (http://www.webtoolkit.info/)
	// +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
	// +   improved by: sowberry
	// +	tweaked by: Jack
	// +   bugfixed by: Onno Marsman
	// +   improved by: Yves Sucaet
	// +   bugfixed by: Onno Marsman
	// +   bugfixed by: Ulrich
	// *	 example 1: utf8_encode('Kevin van Zonneveld');
	// *	 returns 1: 'Kevin van Zonneveld'
	var string = (argString + ''); // .replace(/\r\n/g, "\n").replace(/\r/g, "\n");
	var utftext = "",
		start, end, stringl = 0;
 
	start = end = 0;
	stringl = string.length;
	for (var n = 0; n < stringl; n++) {
		var c1 = string.charCodeAt(n);
		var enc = null;
 
		if (c1 < 128) {
			end++;
		} else if (c1 > 127 && c1 < 2048) {
			enc = String.fromCharCode((c1 >> 6) | 192) + String.fromCharCode((c1 & 63) | 128);
		} else {
			enc = String.fromCharCode((c1 >> 12) | 224) + String.fromCharCode(((c1 >> 6) & 63) | 128) + String.fromCharCode((c1 & 63) | 128);
		}
		if (enc !== null) {
			if (end > start) {
				utftext += string.slice(start, end);
			}
			utftext += enc;
			start = end = n + 1;
		}
	}
 
	if (end > start) {
		utftext += string.slice(start, stringl);
	}
 
	return utftext;
}

function sha1 (str) {
	// From php.js (http://phpjs.org/)
	// Calculate the sha1 hash of a string	
	// 
	// version: 1103.1210
	// discuss at: http://phpjs.org/functions/sha1
	// +   original by: Webtoolkit.info (http://www.webtoolkit.info/)
	// + namespaced by: Michael White (http://getsprink.com)
	// +	  input by: Brett Zamir (http://brett-zamir.me)
	// +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
	// -	depends on: utf8_encode
	// *	 example 1: sha1('Kevin van Zonneveld');
	// *	 returns 1: '54916d2e62f65b3afa6e192e6a601cdbe5cb5897'
	var rotate_left = function (n, s) {
		var t4 = (n << s) | (n >>> (32 - s));
		return t4;
	};
	
	var cvt_hex = function (val) {
		var str = "";
		var i;
		var v;
		
		for (i = 7; i >= 0; i--) {
			v = (val >>> (i * 4)) & 0x0f;
			str += v.toString(16);
		}
		return str;
	};
 
	var blockstart;
	var i, j;
	var W = new Array(80);
	var H0 = 0x67452301;
	var H1 = 0xEFCDAB89;
	var H2 = 0x98BADCFE;
	var H3 = 0x10325476;
	var H4 = 0xC3D2E1F0;
	var A, B, C, D, E;
	var temp;
 
	str = this.utf8_encode(str);
	var str_len = str.length;
 
	var word_array = [];
	for (i = 0; i < str_len - 3; i += 4) {
		j = str.charCodeAt(i) << 24 | str.charCodeAt(i + 1) << 16 | str.charCodeAt(i + 2) << 8 | str.charCodeAt(i + 3);
		word_array.push(j);
	}
 
	switch (str_len % 4) {
	case 0:
		i = 0x080000000;
		break;
	case 1:
		i = str.charCodeAt(str_len - 1) << 24 | 0x0800000;
		break;
	case 2:
		i = str.charCodeAt(str_len - 2) << 24 | str.charCodeAt(str_len - 1) << 16 | 0x08000;
		break;
	case 3:
		i = str.charCodeAt(str_len - 3) << 24 | str.charCodeAt(str_len - 2) << 16 | str.charCodeAt(str_len - 1) << 8 | 0x80;
		break;
	}
 
	word_array.push(i);
 
	while ((word_array.length % 16) != 14) {
		word_array.push(0);
	}
 
	word_array.push(str_len >>> 29);
	word_array.push((str_len << 3) & 0x0ffffffff);
 
	for (blockstart = 0; blockstart < word_array.length; blockstart += 16) {
		for (i = 0; i < 16; i++) {
			W[i] = word_array[blockstart + i];
		}
		for (i = 16; i <= 79; i++) {
			W[i] = rotate_left(W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16], 1);
		}
 
 
		A = H0;
		B = H1;
		C = H2;
		D = H3;
		E = H4;
 
		for (i = 0; i <= 19; i++) {
			temp = (rotate_left(A, 5) + ((B & C) | (~B & D)) + E + W[i] + 0x5A827999) & 0x0ffffffff;
			E = D;
			D = C;
			C = rotate_left(B, 30);
			B = A;
			A = temp;
		}
 
		for (i = 20; i <= 39; i++) {
			temp = (rotate_left(A, 5) + (B ^ C ^ D) + E + W[i] + 0x6ED9EBA1) & 0x0ffffffff;
			E = D;
			D = C;
			C = rotate_left(B, 30);
			B = A;
			A = temp;
		}
 
		for (i = 40; i <= 59; i++) {
			temp = (rotate_left(A, 5) + ((B & C) | (B & D) | (C & D)) + E + W[i] + 0x8F1BBCDC) & 0x0ffffffff;
			E = D;
			D = C;
			C = rotate_left(B, 30);
			B = A;
			A = temp;
		}
 
		for (i = 60; i <= 79; i++) {
			temp = (rotate_left(A, 5) + (B ^ C ^ D) + E + W[i] + 0xCA62C1D6) & 0x0ffffffff;
			E = D;
			D = C;
			C = rotate_left(B, 30);
			B = A;
			A = temp;
		}
 
		H0 = (H0 + A) & 0x0ffffffff;
		H1 = (H1 + B) & 0x0ffffffff;
		H2 = (H2 + C) & 0x0ffffffff;
		H3 = (H3 + D) & 0x0ffffffff;
		H4 = (H4 + E) & 0x0ffffffff;
	}
 
	temp = cvt_hex(H0) + cvt_hex(H1) + cvt_hex(H2) + cvt_hex(H3) + cvt_hex(H4);
	return temp.toLowerCase();
}