Thank you for the advice.
I wasn't able to find a specific PHP script to accomplish what we needed. But I'm copying the section of code for the first two questions (we have 10) using javascript just in case it is helpful to someone else. Not very elegant, but gets the job done.
<table>
<tr>
<td><label for="a">Reason for wildlife rescue</label></td>
<td><label class="bold">Injured</label><input name="a" type="radio" value="Yes" onclick = "showMessagea(1)"/></td>
<td><label class="bold">Orphaned</label><input name="a" type="radio" value="No" onclick = "showMessagea(2)"/></td>
</tr>
</table>
<br />
<div id="a1" style="display:none">Get it to rehabber</div>
<div id="a2" style="display:none">Screen for health</div>
<div id="screen" style="display:none">
<table>
<tr>
<td><label for="b">Do any of these conditions apply?</label></td>
<td><label class="bold">Lethargic</label><input name="b" type="radio" value="Yes" onclick = "showMessageb(1)"/></td>
<td><label class="bold">Blood, fractures or other visible injuries</label><input name="b" type="radio" value="No" onclick = "showMessageb(2)"/></td>
</tr>
</table>
</div>
<div id="b1" style="display:none">Provide supplemental heat and transport to wildlife rehabilitator</div>
<div id="b2" style="display:none">Immediately transport to wildlife rehabilitator</div>
<script type = "text/javascript">
function showMessagea(which) {
if (which == 1) {
document.getElementById("a1").style.display = "block";
document.getElementById("a2").style.display = "none";
document.getElementById("screen").style.display = "none";
document.getElementById("b1").style.display = "none";
document.getElementById("b2").style.display = "none";
}
else {
document.getElementById("a1").style.display = "none";
document.getElementById("a2").style.display = "block";
document.getElementById("screen").style.display = "block";
document.getElementById("b1").style.display = "none";
document.getElementById("b2").style.display = "none";
}
}
function showMessageb(which) {
if (which == 1) {
document.getElementById("a1").style.display = "none";
document.getElementById("a2").style.display = "block";
document.getElementById("b1").style.display = "block";
document.getElementById("b2").style.display = "none";
document.getElementById("screen").style.display = "block";
}
else {
document.getElementById("a1").style.display = "none";
document.getElementById("a2").style.display = "block";
document.getElementById("b1").style.display = "none";
document.getElementById("b2").style.display = "block";
document.getElementById("screen").style.display = "block";
}
}
</script>