<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Hmm, I got it.<br><br>It was a computation problem of the resolution values beacause the maxExtent was not exacly equal with SIZE * 1, SIZE * 5 and SIZE * 10 vs. 256 px slice size.<br>(instead it is something like 1, 1.923, 8.333)<br><br>Also I changed my coordinate function to be similar with the one at<br>http://trac.openlayers.org/wiki/UsingCustomTiles<br>and that fixed my zoom offset problem.<br><br>Dragos.<br><br></td></tr></table><br>