help me in this issue

Hi,
im new to javascript ,here im trying to select an category from
select option ,and that category must display on other select option

2. remove is working fine

pls assist
<script type="text/javascript">
function addOptions(selcat,selmc)
{
var sel=document.getElementById(selcat);
var val=document.getElementById(selmc);
if (val.length==0) return;
for (var i=0;i<zxcsel.options.length;i++){
if (sel.options[i].text== val) return;
}
sel.options[sel.options.length]=new Option(val,'',true,true);
sel.selectedIndex=0;
}
function removeOptions(selectbox)
{
var i;
for(i=selectbox.options.length-1;i>=0;i--) {
if(selectbox.options[i].selected)
selectbox.remove(i);
}
}
</script>
<input type="text" name="category" id="category" value="" size="30" /
//place where i select categories
<input type="button" name="in_add" id="in_add" class="btn_yellow"
value="Add" onclick="addOptions('category','multiselect')";/>

<select name="sel_category" id="multiselect" multiple="multiple"
size="5"> //the selected categories should
<option value="">Automotive Parts</option>
<option value="">Cars</option>
<option value="">Computers</option>
<option value="">Electronics</option>
<option value="">Equipments</option>
<option value="">Rental Property</option>
<option value="">Tickets</option>
</select>
<input type="button" name="in_remove" id="in_submit"
class="btn_yellow" value="Remove"
onClick="removeOptions(multiselect)";/>

Thanks
.

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