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a simple way to disable a group of radio buttons and enable another group.

Browsers: IE4+, NS6+, Opera, Mozilla 1.x

<!---Head--->
<script language=javascript>
function disableTwo(disable,enable){
var x;
x=0;
    for ( x = 0; x <= (disable-1); x++ ) { 
    document.form1.radio2option[x].disabled="true";
    }
document.form1.text2.disabled="true";
//enable one
x=0;
    for ( x = 0; x <= (enable-1); x++ ) { 
    document.form1.radio1option[x].disabled="";
    }
document.form1.text1.disabled="";

}

function disableOne(disable,enable){
var x;
x=0;
    for ( x = 0; x <= (disable-1); x++ ) { 
    document.form1.radio1option[x].disabled="true";
    }
document.form1.text1.disabled="true";
//enable two
x=0;
    for ( x = 0; x <= (enable-1); x++ ) { 
    document.form1.radio2option[x].disabled="";
    }
document.form1.text2.disabled="";

}

</script>

<!---Body--->

<form name=form1>
<br><br><br>
<input type=radio name=radio1 value=radio1 onClick="disableTwo(4,7);" checked>Radio1
<br>&nbsp;&nbsp;&nbsp;<input type=radio name=radio1option value=radio1option>
<br>&nbsp;&nbsp;&nbsp;<input type=radio name=radio1option value=radio1option>
<br>&nbsp;&nbsp;&nbsp;<input type=radio name=radio1option value=radio1option>
<br>&nbsp;&nbsp;&nbsp;<input type=radio name=radio1option value=radio1option>
<br>&nbsp;&nbsp;&nbsp;<input type=radio name=radio1option value=radio1option>
<br>&nbsp;&nbsp;&nbsp;<input type=radio name=radio1option value=radio1option>
<br>&nbsp;&nbsp;&nbsp;<input type=radio name=radio1option value=radio1option><input type=text size=10 name=text1 value=text1>
<br><br><br>

<input type=radio name=radio1 value=radio1 onclick="disableOne(7,4);">Radio1
<br>&nbsp;&nbsp;&nbsp;<input type=radio name=radio2option value=radio2option>
<br>&nbsp;&nbsp;&nbsp;<input type=radio name=radio2option value=radio2option>
<br>&nbsp;&nbsp;&nbsp;<input type=radio name=radio2option value=radio2option>
<br>&nbsp;&nbsp;&nbsp;<input type=radio name=radio2option value=radio2option>
<input type=text name=text2 size=10 value=text2>
</form>