谷歌地图标记找到错误的位置。如何验证位置？

Question

我必须使用我的网页中的搜索按钮找到用户在谷歌地图中的位置。但它适用于错误的位置，所以我必须验证位置（纬度和经度）以找到标记。我有尝试了很多但标记位于错误的位置也可以。任何人都可以解决我的问题吗？

这是我的地图代码：

     function load() {
      if (GBrowserIsCompatible()) {
        var map = new GMap2(document.getElementById("map"));
        map.addControl(new GSmallMapControl());
        map.addControl(new GMapTypeControl());
        var center = new GLatLng(<?php echo $clat;?>,<?php echo $clng;?>);
        map.setCenter(center, 15);
        geocoder = new GClientGeocoder();
        var marker = new GMarker(center, {draggable: false});  
        map.addOverlay(marker);
        document.getElementById("lat").value = center.lat().toFixed(5);
        document.getElementById("lng").value = center.lng().toFixed(5);

      GEvent.addListener(marker, "dragend", function() {
       var point = marker.getPoint();
          map.panTo(point);
       document.getElementById("lat").value = point.lat().toFixed(5);
       document.getElementById("lng").value = point.lng().toFixed(5);

        });
 }
    }

       function showAddress(id) { 
       var address=document.getElementById(id).value;      
       var n=id.replace("comp_address","");
       var map = new GMap2(document.getElementById("map"));
       map.addControl(new GSmallMapControl());
       map.addControl(new GMapTypeControl());
       if (geocoder) {
        geocoder.getLatLng(
          address,
          function(point) {
            if (!point) {
                document.getElementById('locaterr').innerHTML="Enter valid Location and Search"
              document.getElementById("map").style.display="none";
              document.getElementById(id).focus();

            } else {
                document.getElementById("map").style.display="block";
          document.getElementById("lat"+n).value = point.lat().toFixed(5);
       document.getElementById("lng"+n).value = point.lng().toFixed(5);
         map.clearOverlays()
            map.setCenter(point, 14);
   var marker = new GMarker(point, {draggable: false});  
         map.addOverlay(marker);

        GEvent.addListener(marker, "dragend", function() {
      var pt = marker.getPoint();
         map.panTo(pt);
      document.getElementById("lat"+n).value = pt.lat().toFixed(5);
         document.getElementById("lng"+n).value = pt.lng().toFixed(5);
        });

            }
          }
        );
      }
    }
<input type="text" name="locat" id="comp_address0" value="<?php echo $locat;?>" class="canditate_map_inputbox" onKeyUp="specValidate(comp_address0,locaterr);this.value=this.value.replace(/[^a-zA-Z_ ,\.]/g,'');" onChange="resetlocat()" onblur="comp_addre();"/>
      <input class="go_play_btn_1" type="button" value="search<?php echo $cons['search'];?>"  onclick="showAddress('comp_address0');" /><div class="text_error1"><span id="entlocationntype" style="display:none;color:#C00"> Enter Location And Search</span> </div> <span id="locaterr" style="color:#C00"></span>
      <input type="hidden" id="lat0" name="lat" value="<?php //echo $lats;?>">
      <input type="hidden" id="lng0" name="lng" value="<?php //echo $lngs;?>">