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disabled a checkbox if one of the other 4 is checked and vice versa

Hello Everyone,
This is my function

window.onload = main

function main(){

//ANGIE H.- Angie's Attempt to make NA one of the answers not the others
if((document.OPICForm.SME.checked == true || document.OPICForm.IndividualWorth.checked == true || document.OPICForm.WomanOwned.checked == true || document.OPICForm.MinorityOwned.checked ==true)){
      document.OPICForm.NA.disabled == true;
      document.OPICForm.NA.style.background == "#CCCCCC";

What I'm trying to do is disable the NA, Not Applicable checkbox if one of the other 4 are checked

      <td height="109" class="response">
        <input type="checkbox" id="SME" name="SME" value = <%=sSME%> <%=sSMEChecked%> />
        <b>(i)</b> Small or Medium Enterprise with revenues <= $250 million,<br /> <input type="checkbox" id="IndividualWorth" name="IndividualWorth" value = <%=sIndividualWorth%> <%=sIndividualWorthChecked%> />
        <b>(ii)</b> An individual with net worth <= $67 million,<br /> <input type="checkbox" id="WomanOwned" name="WomanOwned" value = <%=sWomanOwned%>  <%=sWomanOwnedChecked%> />
        <b>(iii)</b> A woman-owned business,<br /> <input type="checkbox" id="MinorityOwned" name="MinorityOwned" value = <%=sMinorityOwned%> <%=sMinorityOwnedChecked%> />
        <b>(iv)</b> A minority-owned business,<br /> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        OR<br />
        <input type="checkbox" id="NA" name="NA" value = <%=sNA%> <%=sNAChecked%> />
        <b>(v)</b> None of the above descriptions apply to any shareholders.<br /> </td>

However my javaScript function's not working, for one thing it should be onBlur, not onLoad am I right?
I'll try that, but how do U do the vice versa, do U use an else?
1 Solution
Gemini532Author Commented:
It's not working even though I added the function onBlur to each checkbox, I'm doing something wrong, can you help?
document.OPICForm.NA.disabled == true;
      document.OPICForm.NA.style.background == "#CCCCCC";

document.OPICForm.NA.disabled = true;
      document.OPICForm.NA.style.background = "#CCCCCC";

a single "="
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