How to add a value(text) from javascript to html:option tag .....

How to populate the <html:option> tag dynamically
I have a tree view, in tree view tag ( <layout:maeuItem> tag i have written "onclick " event )
<layout:menuItem key="${agrovoc.AGURI}" link="#"
                                   onClick="return copyVal(this)">
<script language="javascript" type="text/javascript">
               function copyVal(obj){
               str= obj.innerHTML;
               l = str.length-4;
               xyz= str.substring(12,l);
               document.getElementById('agrovoc').value =document.getElementById('agrovoc').value + xyz+'\n';
               </script>Here "xyz" contains the Term ( the term clicked in the tree view) now i want add these terms ( clicked in tree view) into <html: option> tag.... how to do this.. plz give me some ideas
<html:select property="agrovocbuffer" size="10" >
                    <html:option value="" styleId="agrovoc1"></html:option>
                    </html:select>

Hi,
i have tried with this, it's works fine... but when i click on the next page ( i mean 2 or 3 page etc ) the content of <html:option> are erasing (deleting).. i wanted those terms wht i have selected in the 1st page to remain in <html:option> when i click on 2 nd page also...
Tree view code
<layout:menuItem key="${agrovoc.AGURI}" link="#"
                                   onClick=" copyVal(this)">JavaScript
<script language="javascript" type="text/javascript">
                var i=0;
                var myArray=new Array();
               function copyVal(obj){
                    var flag=0;
               str= obj.innerHTML;
               l = str.length-4;
               xyz= str.substring(12,l);
               while (xyz != null) {
               for( var l=0;l<myArray.length;l++){
               if( myArray[l]==xyz){flag=1;alret("The Term is already selected.");}
               if(flag!=1){
               document.getElementById('agrovoc').options[i] =new Option(xyz,xyz);
               myArray=xyz;
               i++;
               //alert(i);
               xyz=null;
               function del(){
                              var oc=document.getElementById('agrovoc').options;
                              //alert(oc.length);
                              firstBox = document.getElementById('agrovoc');
                              selectedOption = firstBox.options[firstBox.selectedIndex].value;
                              selected = firstBox.options[firstBox.selectedIndex].index;
                              //alert(selected);
                              for( var l=0;l<myArray.length;l++){
               if( myArray[l]==selectedOption){myArray[l]="";}
                              firstBox.options[firstBox.selectedIndex] = null;
                              var oc=document.getElementById('agrovoc').options;
                              //alert(oc.length);
                              for(var x=selected;x<oc.length;x++,selected++)
                              document.getElementById('agrovoc').options[x] =new Option(firstBox.options[selected].value);
                              i=oc.length;
               </script>
<html:select> code<div align="left" id="hopt">
               <td valign="top">
               <logic:present name="hcount">
                    <html:select property="agrovocbuffer" size="15" styleId="agrovoc" multiple="true" style="width:200px;" >
                    <html:option value="" ></html:option>
                    </html:select><html:button property="button" onclick="del()"> DEL</html:button>
               </logic:present>
               </td>
               </div>
And all the above code is in <html:form> tag & i have written a custom pagination page
Now i want all terms which are in <html:option> remain in options when i goto 2 nd page..
how to do this? In the DOM inspector i'm getting the options, but when see the source HTML there are no <html:options>.. when click on the 2 page link the terms which are in <html:option> are not going to the "Action" class .. :(
how to do this .. any idea plz..?

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