//Javascript collection
function Collection() {
    var collection = {};
    var order = [];

    this.add = function (property, value) {
        if (!this.exists(property)) {
            collection[property] = value;
            order.push(property);
        }
    }
    this.remove = function (property) {
        collection[property] = null;
        var ii = order.length;
        while (ii-- > 0) {
            if (order[ii] == property) {
                order[ii] = null;
                break;
            }
        }
    }
    this.toString = function () {
        var output = [];
        for (var ii = 0; ii < order.length; ++ii) {
            if (order[ii] != null) {
                output.push(collection[order[ii]]);
            }
        }
        return output;
    }
    this.getKeys = function () {
        var keys = [];
        for (var ii = 0; ii < order.length; ++ii) {
            if (order[ii] != null) {
                keys.push(order[ii]);
            }
        }
        return keys;
    }

    this.getValue = function (pKey) {
        return collection[pKey];
    }

    this.update = function (property, value) {
        if (value != null) {
            collection[property] = value;
        }
        var ii = order.length;
        while (ii-- > 0) {
            if (order[ii] == property) {
                order[ii] = null;
                order.push(property);
                break;
            }
        }
    }
    this.exists = function (property) {
        return collection[property] != null;
    }
}

function clearIt(what)
{
	if(what.value == what.defaultValue) what.value = '';
}
function setIt(what)
{
	if(what.value == '') what.value = what.defaultValue;
}