$("marker_lon").value = "";
$("marker_lat").value = "";
$("marker_inputs").style.display = "none";
$("marker_lon").value = "";
$("marker_lat").value = "";
$("marker_inputs").style.display = "none";
bounds.transform(epsg4326, epsg900913);
var zoom = map.getZoomForExtent(bounds);
bounds.transform(epsg4326, epsg900913);
var zoom = map.getZoomForExtent(bounds);
var ymax = bounds.top * Math.PI / 180;
var yzoom = Math.LOG2E * (Math.log(2000 * 2 * Math.PI) - Math.log(Math.log((Math.tan(ymax) + 1 / Math.cos(ymax)) / (Math.tan(ymin) + 1 / Math.cos(ymin)))))
var ymax = bounds.top * Math.PI / 180;
var yzoom = Math.LOG2E * (Math.log(2000 * 2 * Math.PI) - Math.log(Math.log((Math.tan(ymax) + 1 / Math.cos(ymax)) / (Math.tan(ymin) + 1 / Math.cos(ymin)))))