$APPLICATION->AddHeadString('
<script>
//some script
</script>
');
<? $this->SetViewTarget("filter1");?>
//Код блока 1
<? $this->EndViewTarget();?>
<? $this->SetViewTarget("filter2");?>
//Код блока 2
<? $this->EndViewTarget();?>
<? $APPLICATION->ShowViewContent('filter1');?>
<!--какой то код и вертска-->
<? $APPLICATION->ShowViewContent('filter2');?>