need help with radiolist and checkboxlist in javascript

[gsaray101]

I have an asp.net page that has one radiolist (called lstcheck) and one checkboxlist (call lstExchange). Depending on the which radiolist item is checked, I need to clear the checkbox list or check them all. I have this function so far but it is not working:

function checkAll()
{
     var radiolist=document.getElementById("lstCheck");
     var checklist=document.getElementById("lstExchange");


        if (radiolist[3].checked=true)
          {
              for (var j=0; j<checklist.lenght; j++)
                {
                   checklist[j].checked=true;
                }
           }

}

I add this line to pageload event on the vb side:

lstCheck.Attrib utes.Add("OnCli ck", "checkAll() ;")

[scripto]

try this

if (radiolist[3].checked==true)
{
for (var j=0; j<checklist.len ght; j++)
{
checklist[j].checked=true;

[gsaray101]

I keep getting:

"Object doesn't support this property or method" error

[gsaray101]

this should be straight forward but it does not seem to be working:

[code=javascript]function function_checka ll()
{

var chk=document.ge tElementById("f orm1");
var chk1=chk.lstExc hange;
var chk2=chk.btnRad io100;
if (chk2.checked ==true ){

for (i=0; i<26; i++)
{
chk1[i].checked=true;
}
}

}[/code]

[acoder]

length is spelt incorrectly. Also use document.getEle mentsByName("ls tCheck") to get the radio button list.