How to save data in join tables in HABTM

Sir
I have three tables like employees ,projects,technologies all joined
with HABTM . I want a form for project model show that I can assign
many employees for a single Project with a technology.

I have taken a multiselect combo box for employees which selects
multiple employees and forward respective ids,and also a technology in
a select box , also it forwards id. but while I am saving Project the
ids could not save in join tables.

How I can pass the ids and how to save.
Mycode in view file of form
<?php if($id == '') {
echo $form -
>create('Project',array('url'=>array('controller'=>'projects','action'=>'save_project'),'name'=>'project_form','type'=>'file'));
//echo $form->input('id');
}else {
echo $form ->
create('Project',array('url'=>array('controller'=>'projects','action'=>'update_project','id'=>
$id),'name'=>'project_form','type'=>'file'));
echo $form -> hidden('id',array('value'=>
$id,'style'=>'display:none;'));
}
echo $form->input('id');
echo $form->input('Employee.id',array('type'=>'hidden','value'=>
$employees);
echo $form->input('Technology.id',array('type'=>'hidden','value'=>
$technologies);
?>

This was typed for form and other fields are in their own format.
Please help.

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