luos/workflow/engine/xmlform/processes/processes_availableProcessesUserOptions.xml

<?xml version="1.0"?>
<dynaForm
  type="xmlmenu"
>
<PAGED_TABLE_ID type="private"/>
<PAGED_TABLE_FAST_SEARCH type="FastSearch" label="@G::LoadTranslation(ID_SEARCH)"/>
 <JS type="javascript"><![CDATA[
  add_placeholder("form[PAGED_TABLE_FAST_SEARCH]","@G::LoadTranslation(ID_EMPTY_SEARCH)");
  function add_placeholder (id, placeholder){
   	var el = document.getElementById(id);
   	el.placeholder = placeholder;
     
    el.onfocus = function () {
    	if(this.value == this.placeholder) {
    	  this.value = '';
    	  el.style.cssText  = '';
    	}
     };
     
    el.onblur = function () {
  	  if(this.value.length == 0) {
    	  this.value = this.placeholder;
    	  el.style.cssText = 'color:#A9A9A9;';
        }
    };
     
  	el.onblur();
  }
]]></JS>

</dynaForm>