function CHistory() {
	this.Entries = new Array();
}

CHistory.prototype.addEntry = function(psEntry) {
	if (goHistory.length == 0) {
		this.Entries.push(psEntry)
	} else if (this.Entries[this.Entries.length-1] != psEntry) {
		this.Entries.push(psEntry)
	}
}

CHistory.prototype.back = function(poFunction) {
	if (this.Entries.length > 1) {
		lsPageID = this.Entries[this.Entries.length-2];
		this.Entries.splice(this.Entries.length-2,2);
		if (poFunction) {
			poFunction(lsPageID);
		}
	}
}

CHistory.prototype.getLength = function() {
	return this.Entries.length;
}