This script work correctly, try it.
<cfif isDefined("Form.submit")>
<cfloop list="#form.fac#" index="f"
delimiters="crlf"><cfoutput>#f#</cfoutput></cfloop>
</cfif>
<form name="internships" action="" onsubmit="return val()" method="post">
<script>
function is_checked() {
var formObj = document['internships']['fac'];
var count = 0;
for (i=0;i<formObj.length; i++) {
if(formObj[i].type == 'checkbox') {
if(formObj[i].checked) count++;
}
}
if (count < 3) {
return false;
}else {
return true;
}
}
function val(){
if (!is_checked()){
alert('You Must Choose 3 Faculty Supervisors');
return false;
}else {
return true;
}
}
</script>
<tr><td align="right" valign="top"><strong>Faculty Supvisor:</strong> <br
/><font style="color: #BD2925; font-size: xx-small;">(Choose 3)</font>
</td><td>
<br />
<input type="checkbox" name="fac" value="Joseph Ashcroft" /> Joseph Ashcroft<br
/> <input type="checkbox" name="fac" value="Paul Lippert" /> Paul Lippert<br />
<input type="checkbox" name="fac" value="Charles Warner" /> Charles Warner<br
/> <input type="checkbox" name="fac" value="Marcia Godich" /> Marcia Godich<br
/> <input type="checkbox" name="fac" value="Andrea McClanahan" /> Andrea
McClanahan<br>
<input type="checkbox" name="fac" value="Glenn Geiser-Getz" /> Glenn
Geiser-Getz<br /> <input type="checkbox" name="fac" value="Robert McKenzie" />
Robert McKenzie<br /> <input type="checkbox" name="fac" value="Wenji Yan" />
Wenjie Yan<br /> <input type="checkbox" name="fac" value="Patricia Kennedy" />
Patricia Kennedy<br /> <input type="checkbox" name="fac" value="Cem Zeytinoglu"
/> Cem Zeytinoglu
</td></tr>
<input type="submit" value="submit" name="submit" />
</form>
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