<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">I am new to OpenLayers, I can not really find a thorough tutorial. I urgently need help for tooltips:<br><br>1. How to add two different tooltips to the two previous and next button created by this one object: new OpenLayers.Control.NavigationHistory()?<br><br>2. How to add different tooltips to all the buttons (like 4 arrows, zoom in and zoom out buttons) created by this one object: new OpenLayers.Control.PanZoomBar?<br><br>3. where I can find or buy the tutorial or books of OpenLayers?<br><br><br>Thanks in advance.<br><br>Sincerely,<br><br>Sarah<br></td></tr></table><br>