<input type="checkbox" id="PD92" name="PD92" value="Si" onClick="if(this.checked){document.getElementById( 'PD12').disabled=true;document.getElementById('PD1 2').checked=false}else{document.getElementById('PD 12').disabled=false}">
<input type="checkbox" id="PD93" name="PD93" value="Si" onClick="if(this.checked){document.getElementById( 'PD13').disabled=true;document.getElementById('PD1 3').checked=false}else{document.getElementById('PD 13').disabled=false}">
<input type="checkbox" id="PD95" name="PD95" value="Si" onClick="if(this.checked){document.getElementById( 'PD15').disabled=true;document.getElementById('PD1 5').checked=false}else{document.getElementById('PD 15').disabled=false}">
<input type="checkbox" id="PD12" name="PD12" value="Si" onClick="if(this.checked){document.getElementById( 'PD92').disabled=true;document.getElementById('PD9 2').checked=false}else{document.getElementById('PD 92').disabled=false}">
<input type="checkbox" id="PD13" name="PD13" value="Si" onClick="if(this.checked){document.getElementById( 'PD93').disabled=true;document.getElementById('PD9 3').checked=false}else{document.getElementById('PD 93').disabled=false}">
<input type="checkbox" id="PD15" name="PD15" value="Si" onClick="if(this.checked){document.getElementById( 'PD95').disabled=true;document.getElementById('PD9 5').checked=false}else{document.getElementById('PD 95').disabled=false}">