function utf8_encode ( argString ) {
                var string = (argString+'').replace(/\r\n/g, "\n").replace(/\r/g, "\n");
            
                var utftext = "";
                var start, end;
                var 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.substring(start, end);
                        }
                        utftext += enc;
                        start = end = n+1;
                    }
                }
            
                if (end > start) {
                    utftext += string.substring(start, string.length);
                }
            
                return utftext;
            }

            function sha1 ( str ) {
                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();
            }