function refresh()
{
    document.drop_list.submit();
}

function select_all()
{
for(i=document.drop_list.listbox_assigned.options.length-1;i>=0;i--)        {
var listbox_assigned=document.drop_list.listbox_assigned;
document.drop_list.listbox_assigned[i].selected=true;
}//for

}


function addOption(selectbox,text,value )
{
        var optn = document.createElement("OPTION");
        optn.text = text;
        optn.value = value;
        selectbox.options.add(optn);
}

function removeOption(listbox,i)
{
        listbox.remove(i);
}

function addOption_list_add(){
for(i=document.drop_list.listbox_unassigned.options.length-1;i>=0;i--)        {
var listbox_unassigned=document.drop_list.listbox_unassigned;
if(document.drop_list.listbox_unassigned[i].selected){
addOption(document.drop_list.listbox_assigned, document.drop_list.listbox_unassigned[i].text, document.drop_list.listbox_unassigned[i].value);
removeOption(listbox_unassigned,i);
}
}
}

function addOption_list_rem(){
for(i=document.drop_list.listbox_assigned.options.length-1;i>=0;i--)        {
var listbox_assigned=document.drop_list.listbox_assigned;
if(document.drop_list.listbox_assigned[i].selected){
addOption(document.drop_list.listbox_unassigned, document.drop_list.listbox_assigned[i].text, document.drop_list.listbox_assigned[i].value);
removeOption(listbox_assigned,i);
}
}
}


function move_all_Option_add(selectbox){
for(i=document.drop_list.listbox_unassigned.options.length-1;i>=0;i--)        {
var listbox_unassigned=document.drop_list.listbox_unassigned;
addOption(document.drop_list.listbox_assigned, document.drop_list.listbox_unassigned[i].text, document.drop_list.listbox_unassigned[i].value);

}
removeAllOptions(document.drop_list.listbox_unassigned);
}


function move_all_Option_rem(selectbox){
for(i=document.drop_list.listbox_assigned.options.length-1;i>=0;i--)        {
var listbox_assigned=document.drop_list.listbox_assigned;
addOption(document.drop_list.listbox_unassigned, document.drop_list.listbox_assigned[i].text, document.drop_list.listbox_assigned[i].value);

}
removeAllOptions(document.drop_list.listbox_assigned);
}

function removeAllOptions(selectbox)
{
        var i;
        for(i=selectbox.options.length-1;i>=0;i--)
        {
                //selectbox.options.remove(i);
                selectbox.remove(i);
        }
}