<script>function marcar(p,f){
for(ii=0;n=f.elements[ii];ii++){
if(n.type=="checkbox")n.checked=p
}
}
</script><body> <form id="form1" name="form1" method="post" action=""> <input name="uno" type="checkbox" id="uno" value="checkbox" /<uno
<br/> <input name="dos" type="checkbox" id="dos" value="checkbox" />dos
<br/> <input name="tres" type="checkbox" id="tres" value="checkbox" />tres
<br /> <input name="cuatro" type="checkbox" id="cuatro" value="checkbox" />cuatro
<br /> <input type="button" name="Submit" value="todos" onclick="marcar(1,this.form)" /> <input type="button" name="Submit2" value="ninguno" onclick="marcar(0,this.form)" /> </form> </body>
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