// Clears the text of a field
function clearText(thefield) {
    if (thefield.defaultValue == thefield.value) {
        thefield.value = ""
    }
}

// Changes to color of a field
function changeFieldColor(thefield, color) {
    thefield.style.color = color;
}


// Checkbox manipulation
function setAllCheckBoxesTo(form, n)
{
    temp = form.elements.length;
    for (i = 0; i < temp; i++) {
        form.elements[i].checked = n;
    }
}
function invertAllCheckBoxes(form) {
    temp = form.elements.length;
    for (i = 0; i < temp; i++) {
       if (form.elements[i].checked == 1) {
            form.elements[i].checked = 0;
        }
        else {
            form.elements[i].checked = 1
        }
    }
}

// Set the status of all checkboxes in the immediate enclosing table
// to match the checked status of the object passed in.
// Usage : <input type="checkbox" onclick="updateCheckboxes(this)"/>
function updateCheckboxes(obj)
{
	var t = obj;
	while (t.nodeName != 'TABLE' && t.parentNode != null)
	{
		t = t.parentNode;
	}
	var c = t.getElementsByTagName('INPUT');
	var f = obj.checked;
	for (var i = 0; i < c.length; i++)
	{
		if (c[i] != obj && c[i].type == 'checkbox')
		{
			c[i].checked = f;
		}
	}
}

function lastIndexOfAny(str, charArray, fromPos) {
    var lastIndexOf = -1;
    for (i=0; i<charArray.length; i++) {
        var charLastIndexOf = str.lastIndexOf(charArray[i], fromPos);
        if (-1 == lastIndexOf
            || lastIndexOf < charLastIndexOf) {
            lastIndexOf = charLastIndexOf;
        }
    } 
    return lastIndexOf;
}

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();