var menuLeft = Class.create ();
menuLeft.prototype = {
	initialize: function () {
		var E = false;
		if (arguments.length > 0) {
			if (typeof arguments[0] == "string" ) {
				E = arguments[0];
			}
			else
				E = arguments[0] ? arguments[0].E : null;
		}

		if (!E && !$(E)) {
			alert ("No E of menu.\nMake sure your E is defined in constructor or install the prototype library first...");
			return false;
		}

		this.options = Object.extend ({
				E        : 'div[class="menuLeft"]',
				EP       : 'div["class="section"]',
				EC       : 'div[class="node"]',
				PE       : "p",
				PEC      : "#134B76",
				PECOver  : "#6F7478",
				PECClick : "#367FA8",
				classPEA : "parrow",
				PEA      : "./images/strzalka1.gif",
				PEAOver  : "./images/arrow_parent2.gif",
				PEAClick : "./images/arrow_parent3.gif",
				CE       : false,
				CEC      : "#8DBEDC",
				CECOver  : "#8DBEDC",
				CECClick : "#8DBEDC",
				classCEA : "carrow",
				CEA      : "./images/strzalka1.gif",
				CEAOver  : "./images/arrow_child2.gif",
				CEAClick : "./images/arrow_parent3.gif"},
		arguments[0] || {}
		);

	this.open = new Array ();
	var P = this;
	var O = P.options;

	$$(this.options.E).each (function (element) {
		Element.select (element, O.EP).each (function (section, index) {
			Element.select (section, O.PE).each (function (PE, index) {
				PE.setAttribute ('id', P._MD5(PE.innerHTML));
				P.open[this.id] = false;
				PE.observe ('click', function (event) {
					if (!P.open[this.id]) {
						P.sectionOpen (section, this);
					}
					else if (P.open[this.id]) {
						P.sectionClose (section, this);
					}
				});
				PE.observe ('mouseover', function (event) {
					P.sectionOver (section, this);
				});
				PE.observe ('mouseout', function (event) {
					P.sectionOut (section, this);
				});
			})
		})
	})
	$$(this.options.E).each (function (element) {
		if (Element.select (element, 'a[class="open"]')[0]) {
			var element = Element.select (element, 'a[class="open"]')[0];
			element = element.up (1);
			P.sectionOpen (element, Element.select (element, O.PE)[0]);
		}
	})
	$$(this.options.E).each (function (element) {
		var element =  Element.select (element, O.EC).last();
		element.style.background = "#fff url(../images/menu-bottom.gif) no-repeat left top";
	})
	$$(this.options.E).each (function (element) {
		var element =  Element.select (element, O.PE).last();
		element.observe ('click', function (event) {
			element.style.background = (P.open[element.id] ? element.style.background = O.PECClick : O.PEC+" url(../images/A7_flip.gif) no-repeat right top");
			element.observe ('mouseover', function (event) {
				element.style.background = (P.open[element.id] ? element.style.background = O.PECClick : O.PECOver+" url(../images/F2__szary_flip.gif) no-repeat right top");
			});
			element.observe ('mouseout', function (event) {
				element.style.background = (P.open[element.id] ? element.style.background = O.PECClick : O.PEC+" url(../images/A7_flip.gif) no-repeat right top");
			});
		});

		if (!P.open[element.id]) {
			element.style.background = (P.open[element.id] ? element.style.background = O.PECClick : O.PEC+" url(../images/A7_flip.gif) no-repeat right top");
			element.observe ('mouseover', function (event) {
				element.style.background = (P.open[element.id] ? element.style.background = O.PECClick : O.PECOver+" url(../images/F2__szary_flip.gif) no-repeat right top");
			});
			element.observe ('mouseout', function (event) {
				element.style.background = (P.open[element.id] ? element.style.background = O.PECClick : O.PEC+" url(../images/A7_flip.gif) no-repeat right top");
			});
		}
	})
	},

	sectionOver: function (section, element) {
		var P = this;
		var O = this.options;
		if (!P.open[element.id]) {
			element.style.backgroundColor = O.PECOver;
			Element.select (section, 'img[class="'+O.classPEA+'"]').each (function (element) {
				element.src = O.PEAOver;
			})
		}
	},

	sectionOut: function (section, element) {
		var P = this;
		var O = this.options;
		if (!P.open[element.id]) {
			element.style.backgroundColor = O.PEC;
			Element.select (section, 'img[class="'+O.classPEA+'"]').each (function (element) {
				element.src = O.PEA;
			})
		}
	},

	sectionOpen: function (section, element) {
		var P = this;
		var O = this.options;
		if (!P.open[element.id]) {
			P.open[element.id] = true;
			element.style.backgroundColor = O.PECClick;
			Element.select (section, 'img[class="'+O.classPEA+'"]').each (function (element) {
				element.src = O.PEAClick;
			})
			P.nodesOpen (section);
		}
	},

	sectionClose: function (section, element) {
		var P = this;
		var O = this.options;
		if (P.open[element.id]) {
			P.open[element.id] = false;
			element.style.backgroundColor = O.PEC;
			Element.select (section, 'img[class="'+O.classPEA+'"]').each (function (element) {
				element.src = O.PEA;
			})
			P.nodesClose (section);
		}
	},

	nodesOpen: function (section) {
		var P = this;
		var O = this.options;
		Element.select (section, O.EC).each (function (EC) {
			EC.style.display = 'block';
			if (Element.select (EC, 'a')[0]) {
				EC.observe ('click', function (event) {
					document.location.href = Element.select (EC, 'a')[0].href;
				});
			}
			EC.observe ('mouseover', function (event) {
				if (EC.style.background == "") {
					EC.style.backgroundColor = O.CECOver;
				}
				Element.select (EC, 'img[class="'+O.classCEA+'"]').each (function (CEA) {
					CEA.src = O.CEAOver;
				})
			});
			EC.observe ('mouseout', function (event) {
				if (EC.style.background == "") {
					EC.style.backgroundColor = O.CEC;
				}
				Element.select (EC, 'img[class="'+O.classCEA+'"]').each (function (CEA) {
					CEA.src = O.CEA;
				})
			});
		})
	},

	nodesClose: function (section) {
		var P = this;
		var O = this.options;
		Element.select (section, O.EC).each (function (EC) {
			EC.style.display = 'none';
		})
		Element.select (section, 'img[class="'+O.classPEA+'"]').each (function (element) {
			element.src = O.PEA;
		})
	},

	_MD5: function (string) {
		function RotateLeft(lValue, iShiftBits) {
			return (lValue<<iShiftBits) | (lValue>>>(32-iShiftBits));
		}
		
		function AddUnsigned(lX,lY) {
			var lX4,lY4,lX8,lY8,lResult;
			lX8 = (lX & 0x80000000);
			lY8 = (lY & 0x80000000);
			lX4 = (lX & 0x40000000);
			lY4 = (lY & 0x40000000);
			lResult = (lX & 0x3FFFFFFF)+(lY & 0x3FFFFFFF);
			if (lX4 & lY4) {
				return (lResult ^ 0x80000000 ^ lX8 ^ lY8);
			}
			if (lX4 | lY4) {
				if (lResult & 0x40000000) {
					return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);
				} 
				else {
					return (lResult ^ 0x40000000 ^ lX8 ^ lY8);
				}
			}
			else {
				return (lResult ^ lX8 ^ lY8);
			}
		}

		function F(x,y,z) { return (x & y) | ((~x) & z); }
		function G(x,y,z) { return (x & z) | (y & (~z)); }
		function H(x,y,z) { return (x ^ y ^ z); }
		function I(x,y,z) { return (y ^ (x | (~z))); }

		function FF(a,b,c,d,x,s,ac) {
			a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac));
			return AddUnsigned(RotateLeft(a, s), b);
		};
		
		function GG(a,b,c,d,x,s,ac) {
			a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac));
			return AddUnsigned(RotateLeft(a, s), b);
		};

		function HH(a,b,c,d,x,s,ac) {
			a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac));
			return AddUnsigned(RotateLeft(a, s), b);
		};

		function II(a,b,c,d,x,s,ac) {
			a = AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac));
			return AddUnsigned(RotateLeft(a, s), b);
		};

		function ConvertToWordArray(string) {
			var lWordCount;
			var lMessageLength = string.length;
			var lNumberOfWords_temp1=lMessageLength + 8;
			var lNumberOfWords_temp2=(lNumberOfWords_temp1-(lNumberOfWords_temp1 % 64))/64;
			var lNumberOfWords = (lNumberOfWords_temp2+1)*16;
			var lWordArray=Array(lNumberOfWords-1);
			var lBytePosition = 0;
			var lByteCount = 0;
			while ( lByteCount < lMessageLength ) {
				lWordCount = (lByteCount-(lByteCount % 4))/4;
				lBytePosition = (lByteCount % 4)*8;
				lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount)<<lBytePosition));
				lByteCount++;
			}
			lWordCount = (lByteCount-(lByteCount % 4))/4;
			lBytePosition = (lByteCount % 4)*8;
			lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80<<lBytePosition);
			lWordArray[lNumberOfWords-2] = lMessageLength<<3;
			lWordArray[lNumberOfWords-1] = lMessageLength>>>29;
			return lWordArray;
		};

    function WordToHex(lValue) {
			var WordToHexValue="",WordToHexValue_temp="",lByte,lCount;
			for (lCount = 0;lCount<=3;lCount++) {
				lByte = (lValue>>>(lCount*8)) & 255;
				WordToHexValue_temp = "0" + lByte.toString(16);
				WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length-2,2);
			}
			return WordToHexValue;
		};

		function Utf8Encode(string) {
			string = string.replace (/\r\n/g,"\n");
			var utftext = "";
			for (var n = 0; n < string.length; n++) {
				var c = string.charCodeAt(n);
				if (c < 128) {
					utftext += String.fromCharCode(c);
				}
				else if((c > 127) && (c < 2048)) {
					utftext += String.fromCharCode((c >> 6) | 192);
					utftext += String.fromCharCode((c & 63) | 128);
				}
				else {
					utftext += String.fromCharCode((c >> 12) | 224);
					utftext += String.fromCharCode(((c >> 6) & 63) | 128);
					utftext += String.fromCharCode((c & 63) | 128);
				}
			}
		return utftext;
		};

		var x=Array();
		var k,AA,BB,CC,DD,a,b,c,d;
		var S11=7, S12=12, S13=17, S14=22;
		var S21=5, S22=9 , S23=14, S24=20;
		var S31=4, S32=11, S33=16, S34=23;
		var S41=6, S42=10, S43=15, S44=21;
		string = Utf8Encode(string);
		x = ConvertToWordArray(string);
		a = 0x67452301; b = 0xEFCDAB89; c = 0x98BADCFE; d = 0x10325476;
		for (k=0;k<x.length;k+=16) {
			AA=a; BB=b; CC=c; DD=d;
			a=FF(a,b,c,d,x[k+0], S11,0xD76AA478);
			d=FF(d,a,b,c,x[k+1], S12,0xE8C7B756);
			c=FF(c,d,a,b,x[k+2], S13,0x242070DB);
			b=FF(b,c,d,a,x[k+3], S14,0xC1BDECEE);
			a=FF(a,b,c,d,x[k+4], S11,0xF57C0FAF);
			d=FF(d,a,b,c,x[k+5], S12,0x4787C62A);
			c=FF(c,d,a,b,x[k+6], S13,0xA8304613);
			b=FF(b,c,d,a,x[k+7], S14,0xFD469501);
			a=FF(a,b,c,d,x[k+8], S11,0x698098D8);
			d=FF(d,a,b,c,x[k+9], S12,0x8B44F7AF);
			c=FF(c,d,a,b,x[k+10],S13,0xFFFF5BB1);
			b=FF(b,c,d,a,x[k+11],S14,0x895CD7BE);
			a=FF(a,b,c,d,x[k+12],S11,0x6B901122);
			d=FF(d,a,b,c,x[k+13],S12,0xFD987193);
			c=FF(c,d,a,b,x[k+14],S13,0xA679438E);
			b=FF(b,c,d,a,x[k+15],S14,0x49B40821);
			a=GG(a,b,c,d,x[k+1], S21,0xF61E2562);
			d=GG(d,a,b,c,x[k+6], S22,0xC040B340);
			c=GG(c,d,a,b,x[k+11],S23,0x265E5A51);
			b=GG(b,c,d,a,x[k+0], S24,0xE9B6C7AA);
			a=GG(a,b,c,d,x[k+5], S21,0xD62F105D);
			d=GG(d,a,b,c,x[k+10],S22,0x2441453);
			c=GG(c,d,a,b,x[k+15],S23,0xD8A1E681);
			b=GG(b,c,d,a,x[k+4], S24,0xE7D3FBC8);
			a=GG(a,b,c,d,x[k+9], S21,0x21E1CDE6);
			d=GG(d,a,b,c,x[k+14],S22,0xC33707D6);
			c=GG(c,d,a,b,x[k+3], S23,0xF4D50D87);
			b=GG(b,c,d,a,x[k+8], S24,0x455A14ED);
			a=GG(a,b,c,d,x[k+13],S21,0xA9E3E905);
			d=GG(d,a,b,c,x[k+2], S22,0xFECFA3F8);
			c=GG(c,d,a,b,x[k+7], S23,0x676F02D9);
			b=GG(b,c,d,a,x[k+12],S24,0x8D2A4C8A);
			a=HH(a,b,c,d,x[k+5], S31,0xFFFA3942);
			d=HH(d,a,b,c,x[k+8], S32,0x8771F681);
			c=HH(c,d,a,b,x[k+11],S33,0x6D9D6122);
			b=HH(b,c,d,a,x[k+14],S34,0xFDE5380C);
			a=HH(a,b,c,d,x[k+1], S31,0xA4BEEA44);
			d=HH(d,a,b,c,x[k+4], S32,0x4BDECFA9);
			c=HH(c,d,a,b,x[k+7], S33,0xF6BB4B60);
			b=HH(b,c,d,a,x[k+10],S34,0xBEBFBC70);
			a=HH(a,b,c,d,x[k+13],S31,0x289B7EC6);
			d=HH(d,a,b,c,x[k+0], S32,0xEAA127FA);
			c=HH(c,d,a,b,x[k+3], S33,0xD4EF3085);
			b=HH(b,c,d,a,x[k+6], S34,0x4881D05);
			a=HH(a,b,c,d,x[k+9], S31,0xD9D4D039);
			d=HH(d,a,b,c,x[k+12],S32,0xE6DB99E5);
			c=HH(c,d,a,b,x[k+15],S33,0x1FA27CF8);
			b=HH(b,c,d,a,x[k+2], S34,0xC4AC5665);
			a=II(a,b,c,d,x[k+0], S41,0xF4292244);
			d=II(d,a,b,c,x[k+7], S42,0x432AFF97);
			c=II(c,d,a,b,x[k+14],S43,0xAB9423A7);
			b=II(b,c,d,a,x[k+5], S44,0xFC93A039);
			a=II(a,b,c,d,x[k+12],S41,0x655B59C3);
			d=II(d,a,b,c,x[k+3], S42,0x8F0CCC92);
			c=II(c,d,a,b,x[k+10],S43,0xFFEFF47D);
			b=II(b,c,d,a,x[k+1], S44,0x85845DD1);
			a=II(a,b,c,d,x[k+8], S41,0x6FA87E4F);
			d=II(d,a,b,c,x[k+15],S42,0xFE2EC6E0);
			c=II(c,d,a,b,x[k+6], S43,0xA3014314);
			b=II(b,c,d,a,x[k+13],S44,0x4E0811A1);
			a=II(a,b,c,d,x[k+4], S41,0xF7537E82);
			d=II(d,a,b,c,x[k+11],S42,0xBD3AF235);
			c=II(c,d,a,b,x[k+2], S43,0x2AD7D2BB);
			b=II(b,c,d,a,x[k+9], S44,0xEB86D391);
			a=AddUnsigned(a,AA);
			b=AddUnsigned(b,BB);
			c=AddUnsigned(c,CC);
			d=AddUnsigned(d,DD);
		}
		var temp = WordToHex(a)+WordToHex(b)+WordToHex(c)+WordToHex(d);
		return temp.toLowerCase();
	}
};