var numberRegEx = /[0-9]/

function isNumber(event, from) {
    return numberRegEx.test(getEventChar(event)) || (getEventKeyCode(event) < 32);
}

function onKeyPressMaxLengthChangeFocus(event, preConditions, from, to) {
	var ok = true;
	var functionPointer;
	for (var i = 0; i < preConditions.length; i++) {
		functionPointer = preConditions[i];
		ok = ok && functionPointer(event, from);
		if (!ok) {
			return false;
		}
	}
	if (reachedMaxLength(event, from)) {
		to.focus();
    if (!reachedMaxLength(event, to)) {
		  to.value += getEventChar(event);
		}
  	return false;
	}
	return true;
}

function getEventKeyCode(event){
    var result = 0;
    if (BrowserDetect.browser == "Explorer") {
        // Prevent paste
        if (event.ctrlKey) {
            event.cancelable = true;
            event.bubbles = false;
        }
        result = event.keyCode;
    } else {
    	if (BrowserDetect.browser == "Netscape" || BrowserDetect.browser == "Firefox") {
            //Prevent paste
            if (event.ctrlKey) {
                event.cancleBubble = true;
            }
			result = event.charCode;
	    }
    }
    return result;
}

function getEventChar(event){
    if (getEventKeyCode(event) < 32) {
        return "";
    }
    return String.fromCharCode(getEventKeyCode(event));
}

function reachedMaxLength(event, from) {

    var totalLength = from.value.length;// + getEventChar(event).length;

    if (getEventKeyCode(event) < 32) {
        return false;
    }

    if (totalLength  >= from.maxLength) {
        return true;
    }

    return false;
}

/* from quirksmode */
var BrowserDetect = {
	init: function () {
		this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
		this.version = this.searchVersion(navigator.userAgent)
			|| this.searchVersion(navigator.appVersion)
			|| "an unknown version";
		this.OS = this.searchString(this.dataOS) || "an unknown OS";
	},
	searchString: function (data) {
		for (var i=0;i<data.length;i++)	{
			var dataString = data[i].string;
			var dataProp = data[i].prop;
			this.versionSearchString = data[i].versionSearch || data[i].identity;
			if (dataString) {
				if (dataString.indexOf(data[i].subString) != -1)
					return data[i].identity;
			}
			else if (dataProp)
				return data[i].identity;
		}
	},
	searchVersion: function (dataString) {
		var index = dataString.indexOf(this.versionSearchString);
		if (index == -1) return;
		return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
	},
	dataBrowser: [
		{ 	string: navigator.userAgent,
			subString: "OmniWeb",
			versionSearch: "OmniWeb/",
			identity: "OmniWeb"
		},
		{
			string: navigator.vendor,
			subString: "Apple",
			identity: "Safari"
		},
		{
			prop: window.opera,
			identity: "Opera"
		},
		{
			string: navigator.vendor,
			subString: "iCab",
			identity: "iCab"
		},
		{
			string: navigator.vendor,
			subString: "KDE",
			identity: "Konqueror"
		},
		{
			string: navigator.userAgent,
			subString: "Firefox",
			identity: "Firefox"
		},
		{
			string: navigator.vendor,
			subString: "Camino",
			identity: "Camino"
		},
		{		// for newer Netscapes (6+)
			string: navigator.userAgent,
			subString: "Netscape",
			identity: "Netscape"
		},
		{
			string: navigator.userAgent,
			subString: "MSIE",
			identity: "Explorer",
			versionSearch: "MSIE"
		},
		{
			string: navigator.userAgent,
			subString: "Gecko",
			identity: "Mozilla",
			versionSearch: "rv"
		},
		{ 		// for older Netscapes (4-)
			string: navigator.userAgent,
			subString: "Mozilla",
			identity: "Netscape",
			versionSearch: "Mozilla"
		}
	],
	dataOS : [
		{
			string: navigator.platform,
			subString: "Win",
			identity: "Windows"
		},
		{
			string: navigator.platform,
			subString: "Mac",
			identity: "Mac"
		},
		{
			string: navigator.platform,
			subString: "Linux",
			identity: "Linux"
		}
	]

};

BrowserDetect.init();