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<script type="text/javascript">function checkall(formname,thestate){var el_collection=eval("document.forms."+formname)for (c=0;c<el_collection.length;c++){if(el_collection[c].type=='checkbox') el_collection[c].checked=thestate;} }</script><div align="right"><a href="javascript:checkall('action','true')">Seleccionar todas</a><a href="javascript:checkall('action','false')">Seleccionar nenhuma</a></div>