if(GETPOST("button_removefilter_x")||GETPOST("button_removefilter.x")||GETPOST("button_removefilter"))// Both test are required to be compatible with all browsers
if(GETPOST("button_removefilter_x")||GETPOST("button_removefilter.x")||GETPOST("button_removefilter"))// All tests are required to be compatible with all browsers
if($massactionbutton||$massaction)// If we are in select mode (massactionbutton defined) or if we have already selected and sent an action ($massaction) defined