[Google Maps API v2] remove markers and polylines

I try to use following code -- but the removal 'deletelast()' do's not
work:

var allmarkers = [];
var allpolyline = [];
var map;
var marker;

function deletelast() {
alert(allmarkers.length); // for debuging -- result OK
var i = allmarkers.length;
map.removeOverlay(allmarkers[i-1]); // no change - all markers
remain on the map
allmarkers.splice(count, 1);
var i = allpolyline.length;
map.removeOverlay(allpolyline[i-1]); // no change - all lines
remain on the map
allpolyline.splice(count, 1);
}

function loadMap() {
var map = new GMap2(document.getElementById("map"));
map.addControl(new GLargeMapControl());
map.addControl(new GMapTypeControl());
map.setMapType(G_HYBRID_MAP ); // Hybrid ???!!

var llt = document.details1.rks.value;
var llt_arr = llt.split("_");
var ll_arr = llt_arr[0].split("¦");
var center = new GLatLng(ll_arr[0], ll_arr[1]);
map.setCenter(center, 8);
for (var i = 0; i < llt_arr.length; i++) {
// alert(llt_arr[i]);
var ll_arr = llt_arr[i].split("¦");
var point = new GLatLng(ll_arr[0], ll_arr[1]);
var marker = createMarker(point,ll_arr[3] +"<br><a
href='showspot.php?sp="+ll_arr[2]+"'>click here for more details<\/
a>")
map.addOverlay(marker);
}

GEvent.addListener(map, "click", function(overlay, point){
if (point && document.details1.inssp.checked == true) {
var marker = new GMarker(point,mark_wp)
map.addOverlay(marker);
allmarkers.push(marker);
var t = marker.getLatLng().toUrlValue(6);
var arr = t.split(",");
var il = wayplo.length;
waypla[il] = arr[0];
wayplo[il] = arr[1]; // wayplo.push(arr[1]);
if (il > 0) {
var polyline = new GPolyline([
new GLatLng(waypla[il-1], wayplo[il-1]),
new GLatLng(waypla[il], wayplo[il])
], "#ff0000", 2);
map.addOverlay(polyline);
allpolyline.push(polyline);
}
}
});

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