function initializeHistory() {
   // initialize our DHTML history
   dhtmlHistory.initialize();
   // subscribe to DHTML history change
   // events
   dhtmlHistory.addListener(historyChange);
}

/** Our callback to receive history 
    change events. */
function historyChange(newLocation, historyData) {
	// if historyData == null, the location was probably an anchorlink..
	if(historyData != null) {
		getDataForPage(historyData);
	}
}