fix bug

src/navigator

@@ -12,6 +12,7 @@
 <li>
 <td><input id="search_the_rg" type="value" value="track_name:chr_id:start:end" size=50 title="track_name:chr_id:start:end" /></td>
 <td><input id="search_by_rg" value="search by track_name1:chr_id1:start1:end1;track_name2:chr_id2:start2:end2;" type="button" onclick="search_by_rg()" /></td>
+<td><input id="remove_exists_rg" value="remove all exists regions" type="button" onclick="remove_exists_rg()"></td>
 </li><br>
 <li>
 <td><input onclick="saveSVG('svg-pan-zoom_viewport', svg_width_raw, svg_height_raw, svg_bgcolor)" type=button value='download current image to svg file' ></td>
@@ -82,6 +83,19 @@ function get_hightligh_ratio(){
  hightligh_ratio = parseFloat(hightligh_ratio);
  return hightligh_ratio;
 }
+
+function remove_exists_rg(){
+ for(var index in rg_lists){
+ var gid = rg_lists[index];
+ var exists_rg_pos = document.getElementById(gid);
+ if(exists_rg_pos){
+ exists_rg_pos.remove();
+ console.log("remove "+gid);
+ }
+ }
+ rg_lists = new Array();
+}
+var rg_lists = new Array();
 function search_by_rg(){
  //if(window.refresh_flag >0){
  // alert('sorry, you neet to refresh the page, then you can search the region yet~');
@@ -185,7 +199,7 @@ function search_by_rg(){
  var gid = track_name+"."+chr_id+"."+block_index+"."+rg_pos;
  var exists_rg_pos = document.getElementById(gid);
  if(exists_rg_pos){
- exists_rg_pos.remove();
+ //exists_rg_pos.remove();
  remove_exists = 1;
  continue;
  }
@@ -210,6 +224,7 @@ function search_by_rg(){
  console.log('rect is '+rect.innerHTML);
  console.log("x="+x+",y="+y+",width="+width+",height="+height);
  search_result_num +=1;
+ rg_lists.push(gid)
  }
  }