(function($) {
	$.fn.maskMoney = function(settings) {
		settings = $.extend({
			symbol: "US$",
			decimal: ".",
			precision: 2,
			thousands: ",",
			showSymbol:true
		}, settings);

		settings.symbol=settings.symbol+" ";

		return this.each(function() {
			var input=$(this);
			function money(e) {
				e=e||window.event;
				var k=e.charCode||e.keyCode||e.which;
				if (k == 8) { // tecla backspace
					preventDefault(e);
					var x = input.val().substring(0,input.val().length-1);
					input.val(maskValue(x));
					return false;
				} else if (k == 9) { // tecla tab
					return true;
				}
				if (k < 48 || k > 57) {
					preventDefault(e);
					return true;
				}
				var key = String.fromCharCode(k);  // Valor para o código da Chave
				preventDefault(e);
				input.val(maskValue(input.val()+key));
			}

			function preventDefault(e) {
				if (e.preventDefault) { //standart browsers
					e.preventDefault()
				} else { // internet explorer
					e.returnValue = false
				}
			}

			function maskValue(v) {
				v = v.replace(settings.symbol,"");
				var a = '';
				var strCheck = '0123456789';
				var len = v.length;
				var t = "";
				if (len== 0) {
					t = "0.00";
				}
				for (var i = 0; i < len; i++)
					if ((v.charAt(i) != '0') && (v.charAt(i) != settings.decimal))
						break;

				for (; i < len; i++) {
					if (strCheck.indexOf(v.charAt(i))!=-1) a+= v.charAt(i);
				}

				var n = parseFloat(a);
				n = isNaN(n) ? 0 : n/Math.pow(10, settings.precision);
				t = n.toFixed(settings.precision);

				var p, d = (t=t.split("."))[1].substr(0, settings.precision);
				for (p = (t=t[0]).length; (p-=3) >= 1;) {
					t = t.substr(0,p) + settings.thousands + t.substr(p);
				}
				return setSymbol(t+settings.decimal+d+Array(
					(settings.precision+1)-d.length).join(0));
			}

			function focusEvent() {
				if (input.val()=="") {
					input.val(setSymbol(getDefaultMask()));
				} else {
					input.val(setSymbol(input.val()));
				}
			}

			function blurEvent() {
				if (input.val()==setSymbol(getDefaultMask())) {
					input.val("");
				} else {
					input.val(input.val().replace(settings.symbol,""))
				}
			}

			function getDefaultMask() {
				var n = parseFloat("0")/Math.pow(10, settings.precision);
				return (n.toFixed(settings.precision)).replace(
					new RegExp("\\.", "g"), settings.decimal);
			}

			function setSymbol(v) {
				if (settings.showSymbol) {
					return settings.symbol+v;
				}
				return v;
			}

			input.bind("keypress",money);
			input.bind("blur",blurEvent);
			input.bind("focus",focusEvent);

			input.one("unmaskMoney",function() {
				input.unbind("focus",focusEvent);
				input.unbind("blur",blurEvent);
				input.unbind("keypress",money);
				if ($.browser.msie)
				this.onpaste= null;
				else if ($.browser.mozilla)
				this.removeEventListener('input',blurEvent,false);
			});
		});
	}

	$.fn.unmaskMoney=function() {
		return this.trigger("unmaskMoney");
	};
	
	//Helper Function for Caret positioning
	$.fn.caret=function(begin,end){	
		if(this.length==0) return;
		if (typeof begin == 'number') {
            end = (typeof end == 'number')?end:begin;  
			return this.each(function(){
				if(this.setSelectionRange){
					this.focus();
					this.setSelectionRange(begin,end);
				}else if (this.createTextRange){
					var range = this.createTextRange();
					range.collapse(true);
					range.moveEnd('character', end);
					range.moveStart('character', begin);
					range.select();
				}
			});
        } else {
            if (this[0].setSelectionRange){
				begin = this[0].selectionStart;
				end = this[0].selectionEnd;
			}else if (document.selection && document.selection.createRange){
				var range = document.selection.createRange();			
				begin = 0 - range.duplicate().moveStart('character', -100000);
				end = begin + range.text.length;
			}
			return {begin:begin,end:end};
        }       
	};

	//Predefined character definitions
	var charMap={
		'9':"[0-9]",
		'a':"[A-Za-z]",
		'*':"[A-Za-z0-9]"
	};
	
	//Helper method to inject character definitions
	$.mask={
		addPlaceholder : function(c,r){
			charMap[c]=r;
		}
	};
	
	$.fn.unmask=function(){
		return this.trigger("unmask");
	};
	
	//Main Method
	$.fn.mask = function(mask,settings) {	
		settings = $.extend({
			placeholder: "_",			
			completed: null
		}, settings);		
		
		//Build Regex for format validation
		var re = new RegExp("^"+	
		$.map( mask.split(""), function(c,i){		  		  
		  return charMap[c]||((/[A-Za-z0-9]/.test(c)?"":"\\")+c);
		}).join('')+				
		"$");		

		return this.each(function(){		
			var input=$(this);
			var buffer=new Array(mask.length);
			var locked=new Array(mask.length);
			var valid=false;   
			var ignore=false;  			//Variable for ignoring control keys
			var firstNonMaskPos=null; 
			
			//Build buffer layout from mask & determine the first non masked character			
			$.each( mask.split(""), function(i,c){				
				locked[i]=(charMap[c]==null);				
				buffer[i]=locked[i]?c:settings.placeholder;									
				if(!locked[i] && firstNonMaskPos==null)
					firstNonMaskPos=i;
			});		
			
			function focusEvent(){					
				checkVal();
				writeBuffer();
				setTimeout(function(){
					$(input[0]).caret(valid?mask.length:firstNonMaskPos);					
				},0);
			};
			
			function keydownEvent(e){				
				var pos=$(this).caret();
				var k = e.keyCode;
				ignore=(k < 16 || (k > 16 && k < 32 ) || (k > 32 && k < 41));
				
				//delete selection before proceeding
				if((pos.begin-pos.end)!=0 && (!ignore || k==8 || k==46)){
					clearBuffer(pos.begin,pos.end);
				}	
				//backspace and delete get special treatment
				if(k==8){//backspace					
					while(pos.begin-->=0){
						if(!locked[pos.begin]){								
							buffer[pos.begin]=settings.placeholder;
							if($.browser.opera){
								//Opera won't let you cancel the backspace, so we'll let it backspace over a dummy character.								
								s=writeBuffer();
								input.val(s.substring(0,pos.begin)+" "+s.substring(pos.begin));
								$(this).caret(pos.begin+1);								
							}else{
								writeBuffer();
								$(this).caret(Math.max(firstNonMaskPos,pos.begin));								
							}									
							return false;								
						}
					}						
				}else if(k==46){//delete
					clearBuffer(pos.begin,pos.begin+1);
					writeBuffer();
					$(this).caret(Math.max(firstNonMaskPos,pos.begin));					
					return false;
				}else if (k==27){//escape
					clearBuffer(0,mask.length);
					writeBuffer();
					$(this).caret(firstNonMaskPos);					
					return false;
				}									
			};
			
			function keypressEvent(e){					
				if(ignore){
					ignore=false;
					//Fixes Mac FF bug on backspace
					return (e.keyCode == 8)? false: null;
				}
				e=e||window.event;
				var k=e.charCode||e.keyCode||e.which;						
				var pos=$(this).caret();
								
				if(e.ctrlKey || e.altKey){//Ignore
					return true;
				}else if ((k>=41 && k<=122) ||k==32 || k>186){//typeable characters
					var p=seekNext(pos.begin-1);					
					if(p<mask.length){
						if(new RegExp(charMap[mask.charAt(p)]).test(String.fromCharCode(k))){
							buffer[p]=String.fromCharCode(k);									
							writeBuffer();
							var next=seekNext(p);
							$(this).caret(next);
							if(settings.completed && next == mask.length)
								settings.completed.call(input);
						}				
					}
				}				
				return false;				
			};
			
			function clearBuffer(start,end){
				for(var i=start;i<end&&i<mask.length;i++){
					if(!locked[i])
						buffer[i]=settings.placeholder;
				}				
			};
			
			function writeBuffer(){				
				return input.val(buffer.join('')).val();				
			};
			
			function checkVal(){	
				//try to place charcters where they belong
				var test=input.val();
				var pos=firstNonMaskPos;
				for(var i=0;i<mask.length;i++){					
					if(!locked[i]){
						buffer[i]=settings.placeholder;
						while(pos++<test.length){
							//Regex Test each char here.
							var reChar=new RegExp(charMap[mask.charAt(i)]);
							if(test.charAt(pos-1).match(reChar)){
								buffer[i]=test.charAt(pos-1);								
								break;
							}									
						}
					}
				}
				var s=writeBuffer();
				if(!s.match(re)){							
					input.val("");	
					clearBuffer(0,mask.length);
					valid=false;
				}else
					valid=true;
			};
			
			function seekNext(pos){				
				while(++pos<mask.length){					
					if(!locked[pos])
						return pos;
				}
				return mask.length;
			};
			
			input.one("unmask",function(){
				input.unbind("focus",focusEvent);
				input.unbind("blur",checkVal);
				input.unbind("keydown",keydownEvent);
				input.unbind("keypress",keypressEvent);
				if ($.browser.msie) 
					this.onpaste= null;                     
				else if ($.browser.mozilla)
					this.removeEventListener('input',checkVal,false);
			});
			input.bind("focus",focusEvent);
			input.bind("blur",checkVal);
			input.bind("keydown",keydownEvent);
			input.bind("keypress",keypressEvent);
			//Paste events for IE and Mozilla thanks to Kristinn Sigmundsson
			if ($.browser.msie) 
				this.onpaste= function(){setTimeout(checkVal,0);};                     
			else if ($.browser.mozilla)
				this.addEventListener('input',checkVal,false);
				
			checkVal();//Perform initial check for existing values
		});
	};
})(jQuery);